Create an A4 (is that the size that holds 4 A6?) page, then place the A6 in the upper left corner and use Step and Repeat to make the 4-up.
when I us MS publisher id dose it for me, so when I do business cards 10 up, A5 poster 2 up, so I have to copy it
so there is no way of InDesign to do that for me? its a lot of work to do it manual
Publisher is targeted at home and small office users who need to do their own printing. InDesign is meant for professionals who largely leave the printing to other pros who have the software (and the equipment) to efficiently do any sort of imposition required.
IDImposer is an inexpensive plugin for InDesign that could handle this for you, but I don't see much need for it in this case. It took me longer to type this response than it would have taken to make the 4-up document.