There is a 3.5 character sheet. Actually, there are 3, though I don't know the differences between them. Simply type in 3.5 in the field when you create your game or edit game settings to change the character sheet, and they will come right up. If you have questions about using the "D&D 3.5E" sheet, there is an active thread on it, since it has been undergoing some upgrades recently: https://app.roll20.net/forum/post/10...ade/?pagenum=9
If that sheet is not to your liking, there are also sheets labeled as "D&D 3.5E Adventure Pack" and "D&D 3.5E The Black Company".
Edit: Or else I misunderstood what you were saying and you were just meaning importing existing sheets wasn't available...