How to make a “real time” section in ue4

Hi~I want to know how to make a “real time” section in ue4.like in sketchup

What is a real time section?

:)like this
1.gif
Ths~

Whatever you attached is in an improper format…

An animation of a building being raised?

:)yes,like that

Make sure each section is a separate mesh. Then you turn their visibility on or off with whatever method you want:
Timeline
Sequencer
Mouse clicks
Neural interface