Hi there, Indycals.
There are no number of limits as to how many customers you'll be creating. Though you have inactivated some you can still add more than usual. This is applicable in both QuickBooks Online and QuickBooks Desktop.
Feel free to check out these links that will help you manage your customers:
Should you have other questions or concerns, please let me know. I'll be around for you. Thanks for posting and have a good one.
