Does anyone have any information about this question, considering partner (A) and partner (B)

A: has H1B and is from India, works for US company in USA which will file for his green card on EB2

B: Born in Gautemala. Came to the US (on tourist visa and overstayed) as a child and now has EAD (DACA - Dreamers Act)

If A and B marry, can he use cross charge-ability and both get their GCs? Do they have to travel outside?