How to create vertical lines to the specific rows (section) of the table

Question

I searched a lot but unable to find the appropriate results I used the tickz library as well but it is incompatible with the IEEE access template so drop the idea.

I want to separate the section by using the double line. Reset of other column is working fine using ||l because in the second section (after space) it is needed. In the first half of the table, i don't want a double line in the second column but in the second section, I need a double line for the second column.

Note: I am posting first time. pls let me know if need further explanation.

Please find the attached picture for better understanding.

\begin{table*}[ht]
\centering
\begin{tabular}{|l|l|l|l||l|l||l|l||l|l|}
\toprule
\multicolumn{4}{l}{\textbf{xxxx}}                                                                                                             &\multicolumn{2}{l}{\textbf{xxxxx}}                                                     & \multicolumn{2}{l}{\textbf{xxx}}                                & \multicolumn{2}{l}{\textbf{xxx}}\
\hline
\textbf{Year}                     & \textbf{Date} & \textbf{Year}                       & \textbf{Date} & \textbf{Year}                                            & \textbf{Date} & \textbf{Year}                & \textbf{Date} & \textbf{Year}                            & \textbf{Date} \
\hline
&
&   &  &   }                           & & &    \
  & &    & &  &   & &   & \
& &        &
&  &  & &       & \
& &    &    & &   &&      \
   & &   &                            &      &  &                              \
    &     & &   & &  & &                                                              &                                \
  & &  & & &       &    &                                                              &                                \
    &   &      & &    &&                        &                                                              &                                \
\hline
\multicolumn{2}{l}{\textbf{xxxx                       &   \multicolumn{2}{l}{\textbf{xxx}}                                                                             & \multicolumn{2}{l}{\textbf{xxx}}                                                                                                 & \multicolumn{2}{l}{\textbf{xxxx }}                         & \multicolumn{2}{l}{\textbf{xxxx}}                                \ \hline
\textbf{Year}                     & \textbf{Date} & \textbf{Year}                       & \textbf{ Date } & \textbf{Year}                                            & \textbf{ Date } & \textbf{Year}                & \textbf{ Date } & \textbf{Year}                & \textbf{ Date } \\hline
 & &         &                                                                      &     & & & dataset\cite{ISCXVPN2016}                                                  &  & \
    &           &               & &  &  &                                                                              &                                &                                                  &                                                                                                                        \
 &    & &                                                         &                                &                                                                              &                                &                                                  &                                                              \ 
& &     &    &                                                         &                                &                                                                              &                                &                                                  &         \  [2pt]

\bottomrule
\end{tabular}
\end{table*}

Answer 1

Welcome to TeX.SX! Once you clean up your code, it will be much easier to identify what causes your problems, not only for you, but also for others who may want to help you.

A few remarks:

• Don't mix \toprule and \bottomrule provided by the booktabs package with \hline and vertical borders. Stick to \hline if you want to use vertical borders between columns. The booktabs package does not work well with vertical lines in tables. Also, remove [2pt] from the end of the last row.
• Properly close all the curly brackets and use the correct amount of tab stops (&) in each row in order to make your code clear and understandable for others, for yourself and also for TeX. If you omit tab stops, some vertical lines between the cells might not be printed properly.
• You may use spaces in the argument of tabular where you provide the column defintion. It should be easer to grasp then, where to place the vertical bars (|).

Having said that, from your question I understand that you wish to get something like the following:

\documentclass{article}
\begin{document}
\begin{table}[ht]
\centering
\begin{tabular}{ |l|l| |l|l| |l|l| |l|l| |l|l| }
\hline
\multicolumn{4}{l}{\textbf{xxxx}} &
\multicolumn{2}{l}{\textbf{xxxxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} \
\hline
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} \
\hline
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
\hline
\multicolumn{2}{l}{\textbf{xxxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxxx}} & 
\multicolumn{2}{l}{\textbf{xxxx}} \ 
\hline
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} \
\hline
 & & & & & & & dataset\cite{ISCXVPN2016} & & \
 & & & & & & & & & \
 & & & & & & & & & \ 
 & & & & & & & & & \ 
\hline
\end{tabular}
\end{table}
\end{document}

Edit:

If the double vertical border should only appear in certain rows, you can use the \multicolumn macro to individually style the relevant cells:

\documentclass{article}
\begin{document}
\begin{table}[ht]
\centering
\begin{tabular}{ |l|l|l|l| |l|l| |l|l| |l|l| }
\hline
\multicolumn{4}{l}{\textbf{xxxx}} &
\multicolumn{2}{l}{\textbf{xxxxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} \
\hline
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} \
\hline
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
 & & & & & & & & & \
\hline
\multicolumn{2}{l}{\textbf{xxxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxx}} & 
\multicolumn{2}{l}{\textbf{xxxx}} & 
\multicolumn{2}{l}{\textbf{xxxx}} \ 
\hline
\textbf{Year} & \multicolumn{1}{l||}{\textbf{Date}} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} & 
\textbf{Year} & \textbf{Date} \
\hline
 & \multicolumn{1}{l||}{} & & & & & & dataset\cite{ISCXVPN2016} & & \
 & \multicolumn{1}{l||}{} & & & & & & & & \
 & \multicolumn{1}{l||}{} & & & & & & & & \ 
 & \multicolumn{1}{l||}{} & & & & & & & & \ 
\hline
\end{tabular}
\end{table}
\end{document}

However, I would probably rather consider using two stacked tables.