Questions about syncing apps with iTunes

[RealSkyDiver]

I wanna manage the homescreens on my phone with iTunes, but for that I have to check syncing. Theres always a warning that it will replace apps with existing ones on the computer. Does that mean it will delete all the apps on the phone that aren't on the computer?

 

[Pathfinder3]

Yes it does. So what you will have to do is:
-Connect your iPhone to your computer
-Right click on you iPhone
-select Transfer purchases from iPhone to iTunes