There is no way to permanently delete SKUs from within RestockPro, although you can make them inactive to remove them from Restock Suggestions.
Deactivating SKUs will hide them from your Restock Suggestions view and tell RestockPro to stop calculating suggested restock quantities for them. You can also filter your Products page to show only active SKUs, keeping your list more manageable.
Inactive SKUs can always be marked as active again, in case you decide to start restocking them again.
If marking SKUs as inactive does not meet your needs, and you need to have some SKUs and all their data permanently deleted, we can consider deleting them for you as a one-time courtesy. Please contact us for assistance after deleting the SKUs from Seller Central.