Merge map from marketplace in a single map?

Hi, i have a question, when do you buy a marketplace scene/landscape we have a map demonstration sometimes, a big map already made by the author, is possible combine this map in a single big map?

example: i buy 3 landscape map, load all this 3 mas in a big map in unreal engine (merge them) this is possible?

Using the levels window, you can load as many levels as you want at once: