Sure, you can create as many footnote levels as you like, as shown in the example below. You can also create a footnoteD from within footnoteB, but watch out, this can screw up the sorting of the footnotes quite badly. So please, think of your poor reader and don't skip levels, and keep the footnote'ception to a minimum.
PS: the % at the end of each line is to prevent LaTeX from adding a space between the end of the text and the footnote symbol
\documentclass{article}
\usepackage[ruled]{bigfoot}
\DeclareNewFootnote{A}[arabic]
\DeclareNewFootnote{B}[alph]
\DeclareNewFootnote{C}[Alph]
\DeclareNewFootnote{D}[roman]
\DeclareNewFootnote{E}[Roman]
\DeclareNewFootnote{F}[fnsymbol]
\MakeSortedPerPage{footnoteB}
\MakeSortedPerPage{footnoteC}
\MakeSortedPerPage{footnoteD}
\MakeSortedPerPage{footnoteE}
\MakeSortedPerPage{footnoteF}
\begin{document}
Just some normal text\footnoteA{with footnotes!} and even more text
\footnoteA{This is a nice footnote.%
\footnoteB{Another footnote.%
\footnoteC{Even one more footnote.%
\footnoteD{Omg, when does this end?%
\footnoteE{Please stop!%
\footnoteF{Ok, fine... Just this last one!}
}
}
}
}
}
\end{document}

linguexorgb4e. There are more support for linguistics in CTAN. – Fran Oct 10 '16 at 07:09