Merge surfaces

i have two set of surfaces:

i want to merge them into one

How can i do this?

I assume the surfaces are co-planar.

BooleanUnion trims the surfaces and joins them into a polysurface.

MergeFace merges the planar surfaces into a single trimmed surface.

Alternative to BooleanUnion is to Trim (or Split and Delete the uneeded parts) the individual surfaces, then Join into a polysurface. This is a good skill t have because the Boolean commands do not always work.