Keep only one area and merge it with another from another layer?

Question

Hi, This is on the newbie side, but I can't manage to do it...

I have a layer with several polygons which I need to UNION with another layer that has only one polygon.

I need to be able to have an "expanded polygon" with only the overlapping polygons.

I've tried UNION tool, SPATIAL JOIN and others but haven't managed to pull it off.

Any ideas?

Here's roughly what I want to achieve:

JayantaPoddar · Accepted Answer

You could start with a spatial selection (Select by Location) on Layer 1 (Multiple polygon) where Layer 2 (Single Polygon) INTERSECTS Layer 1.

Once the polygon(s) of Layer 1 are selected, you could export the data (with selected feature parts) to a new layer (Layer 3).

Then execute UNION/MERGE (whichever is necessary) between layer 2 and Layer 3.