How do you build models on roblox

first you go to roblox studio go to your place in edit mode and select every piece of your model go on to the top and click group or press ctrl.+G then select your model go to file go down to publish selection to roblox when another window pops up click create type in the models name and desc. when you want to update it make your updates use the explorer to drag new bricks into model then select your model again click on file blah blah blah when new window pops up click UPDATE not create UPDATE select the model you want to update and there you go!
-myrobloxman