Double click VBA to copy & paste to new list

Hello everyone. I've been trying to find an answer to my question in an existing thread, but haven't been able to do so. I apologize if this has been previously addressed.

I have a purchase order with all of our items and their corresponding item numbers set up. I've included a search box to limit results, as there are about 700 items included in the list. I would like to be able to search the item list, then double click on the item in the results to add to the actual PO. I am not good with VBA, but have pieced together a code that will copy a cell and paste it into the first line on the PO, but would like each subsequently clicked cell to be added to the next line.

Also, it would be ideal if I could double click the item on the PO to remove it, and have the following items move up automatically (so as not to leave a blank row).

Any help from the excel masters would be appreciated!