Bug 5. parts for improvement

To buy upgrade parts for plumbing, electronics, or others, you have to manually click the arrow to increase the quantity. WHY can’t you just type the number? Later, when the parts are already in the inventory, you can’t give them to a family member individually or in a selected amount — only the entire stack (100 or 50 pieces). If I want to give 20 pieces, I have to go back to the computer and manually click the purchase quantity again.