Sometimes you may have a supplier you don’t trade with any more, but instead of deleting the Supplier you should archive them.
Archiving the supplier removed the supplier from drop down lists when creating a receipt but retains all the records associated to the supplier. You should never delete a supplier as deleting the supplier account will delete all receipts associated to it.
Archiving a Supplier is achievable by going to Suppliers> Options> Click Archive Supplier and press Update.