What they do is save you lots and lots of time! Say you need to build a plane that has 4 identical engine nacelles, rather than building all 4 from scratch, you can copy-paste them using the subassembly feature. It's also a great way to move chunks of one build into another project, just tear off the parts you need, save it as an assembly open tge new project and load the saved assembly from there.
Drag a part or parts to the subassembly box in the top left corner. If you go to add a part, scroll down and tap sub assemblies. Now you can copy stuff.
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What they do is save you lots and lots of time! Say you need to build a plane that has 4 identical engine nacelles, rather than building all 4 from scratch, you can copy-paste them using the subassembly feature. It's also a great way to move chunks of one build into another project, just tear off the parts you need, save it as an assembly open tge new project and load the saved assembly from there.
Drag a part or parts to the subassembly box in the top left corner. If you go to add a part, scroll down and tap sub assemblies. Now you can copy stuff.