Lots of asset packs come with premade buildings that just don't have the windows, doors, or general exterior props scattered around. This video shows a way of setting them all up to easily populate them all and be able to merge them together without worrying about overlapping pieces.
The assets I use are from the Fantastic Village Pack from the Unreal Marketplace that's part of the Forever Free collection: https://www.unrealengine.com/marketplace/en-US/product/fantastic-village-pack
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Chapters:
00:00 - Final Product Demo
00:21 - Enable PCG
00:43 - Blueprint Setup
02:55 - PCG Graph Start
03:55 - Set up Sockets in Static Mesh
06:54 - Doors
10:43 - Bottom Windows
13:25 - Upper Windows
13:55 - Quick Window Fix
14:13 - Chimney
14:53 - Combine Building Pieces Setup