polys got separated from their parent

  1. Somehow the small square polys got separated from their parent mesh. How can I get the small squares to be a part of the background plane again?

I should mention the small squares are still joined to the parent plane but if I select the small squares they delete and the parent plane has no holes in it. I need the small squares to cut-out from the parent plane when I delete them. I hope this makes sense.

  1. Also, if it’s not too much to ask. How do I edge crease or “round” a corner. I remember selecting a vertice, then sliding a slider to round it but I don’t remember how. Thanks.

answered in modelling section.