Thanks for joining this thread, TCPT.

As mentioned by my colleague MikiD, we are unable to hide an active item when invoicing a customer.

Locating an item using site or price rule in the invoice screen is also unavailable in QuickBooks. However, you can utilize the Find & Select Items option. It lets you search products or service using the Item Name/Number, Sales and Purchase Description, Preferred Vendor, Man. Part Number, U/M Set and Custom fields.

To easily search an item that is sold for a specific customer, you can modify any of the mentioned fields above.

Here's how:

1. Go to Lists at the top menu bar and select Item List from the drop-down.
2. Double-click the item and enter any detail to help you organize them for a specific customer.
3. Hit OK.

Then, create an invoice and search the item. I'll show you how:

1. Go to Customers at the top menu bar and select Create Invoices.
2. Choose the customer's name at the top.
3. Click the box and the arrow under the Item column and hit <Find & Select Items>.
4. Enter a detail in the Find box, then Search.
5. Continue creating the transaction and click Save & close.

For additional details about editing an item, check out this guide: 

Add, edit, and delete items.

Please to let me know if you need any help with QuickBooks. I'm always here to assist.  I hope to hear about your success!