MAXup, 14 on us tradein, move to another TMobile acc?

Hey everyone,

I am trying to make this iphone trade in work, but may have to switch to a separate tmobile plan as I dont like the people im with.

My current plan has 8+ lines all magenta (I am not the account holder). If I maxup 3 lines, do the iphone trade in, get the 800 credits and EIP going. Then wait like a month. Can I move my 3 MAXup lines to a different tmobile account that is already maxed up? And will my EIP and credits transfer over? I dont think my credits would transfer, right?