I've been drawing a couple of vanities I'll be making as soon as I finish some tile work.
When I draw stuff I draw it in much the same manner as I'll build it. Start with fixed stuff - walls, floor,drains etc. - draw the plinths, cabinet bottoms & partitions, top support, face frame, doors and any cabinet built ins, etc.
I often want to view bits and pieces so I put like things on a layer. Works fine for me except when I get most all drawn and want to drill down to, say, the plinths...lots of layers to turn on/off. I guess groups could work but I've never much messed with them.
Enter "Scenes". I'm sure they are old hat to many of you but they are new to me and they are a godsend. Now I can have a scene with all doors closed, another with all (or some) open; I can have one with just the guts. It is WONDERFUL and all is right with the world :)