combo feeding/ pumping?

just wondering what pumping/ combo feeding looks like?
i have no idea how it would work but i am thinking of doing it for my third baby, my last two i lost my supply at 2/3 months and the last baby was sort of traumatic bc we didn’t know she wasn’t gaining weight from 4-7 months, was in the hospital for a week and she doesn’t take bottles well and ended up with a NG tube she will probably have till she’s a year. I want to give this next baby at least some breast milk but don’t want to breastfeed or full time pump because it seems like it would be a lot to full time pump especially because i have other young kids.

has anyone else pumped and formula fed? how often did you pump or give formula like what would a schedule look like for that?