You actually aren't allowed to charge multiple units in 8th edition.
You can only ever declare a charge on one unit at a time. When you declare a charge on a unit, and for whatever reason your frontage touches another unit when you are in base contact, either you must shift your charging unit so that you don't touch them, or the other unit moves back so that they are at least an inch away.
The only time you are permitted to charge two units at once is if there is no possible way for you avoid contact with two units because of intervening terrain or other units etc.
I don't have my rulebook handy right now, but if I remember correctly, reinforcements happens at the end of the movement phase. They move onto the board up to their full movement from the table edge but cannot move any further, march or charge. If you have the room to place one unit in front of the other as their movement value allows then you can, but apart from that, the unit moves on and thats it. They don't conga line in.
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