Welding on two outer circle

Hello folks, I have drawn a circle with an outline and would like to make the inside a shape so I can weld other surfaces to it. Dont have a clue on how to do it. See the drawing attached. Thanks a bunch!
filter.lbrn2 (63.3 KB)

ok found it. I have to group the two circles. However, I have to union every rectangle to the outer ring. I thought the boolean functions work for multiple sections unioned (or welded) together?

If you group the rectangles as well as your rings Union will give what I think is the desired result. Boolean Assistant is very helpful in previewing the results.
Screenshot 2024-07-01 at 9.38.26 AM

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of course! Thanks Tim!