im making a model with tris a lot more than 10k (the limit) so I need a way to export that mesh, and i want to know how to transfer it 1 part at a time
like i have 4 parts in on model, im trying to transfer the first one, then after thats done the other one, and so on, not all in once.
Thank you 
Hey there. Click file then Export, then waterfront and then save it. Go to ROBLOX studio then insert the mesh. Good luck!
If you want to export selected parts only, make sure nothing else but this is enabled(in the export tab):
If you’re using blender just group the meshes into 2 parts and then export them.
I know you are trying to export it 1 part at a time but have you tried using the decimate modifier and lowering the ratio to reduce the tris?