As far as I know the copied expression needs to be in GridBox format to paste into multiple selected Placeholders, meaning that what you request may be impossible without intermediate conversion.
This at least works, though it may not be applicable to your situation: Table[{a^i}, {i, 3}] // Grid. Note that you must select only the column of vales and not the entire grid or it will still fail; this may be accomplished by drag-selection from within the column rather than from outside it.
GridBoxformat to paste into multiple selected Placeholders, meaning that what you request may be impossible without intermediate conversion.This at least works, though it may not be applicable to your situation:
– Mr.Wizard Aug 28 '14 at 17:17Table[{a^i}, {i, 3}] // Grid. Note that you must select only the column of vales and not the entire grid or it will still fail; this may be accomplished by drag-selection from within the column rather than from outside it.