you can not! stack more than 5 of your units in one hex(the end of turn will destroy your chits over 5 in a stack,Not computers)

The Last slot ,slot 8 is the overload slot! if you try and put a unit in slot 8, you may have the unit displaced to nearby hexes or not moved atall, but sometimes you may get in (especialy if all chits in the target Hex are not DONE etc..), if you try to move a stack into a hex that would occuppy slot 8 then overloading will occur for the whole stack your moveing.

If a Hex has had units Move into it this turn, The Hex May Be Conjested ,disorganised, Blocked, So Movement into it May be effected like overloading.

All units enter a hex from slot 8, and then move deeper into the Hex.