Hi everyone and happy new year

I am cutting out objects from child drawings. I have scanned them, but some of them are REALLY detailed, and I was wondering if there was a way to group selected objects and place them/export them as a png? At the moment, I am just cutting out each object and exporting it to a png, which is working fine. It's just a bit tedious. I've tried hitting 'group' while having all the objects selected, which did group the selected object. However, when I did that I couldn't get rid of the black mask that goes on top of selections...so I guess I am missing a step or two or more?

Thanks in advance.

Linda