I have an immense list of jobs completed that I can select when I create a new invoice, However I need to reduce this list of "descriptions" how do I delete these ?

Hello, @ocd2015.

You can type a keyword or a letter to locate the specific job or service you want to use when creating an invoice. I've added a screenshot for your visual reference.

Also, I'm adding these resources  as additional reference in  managing invoices and transactions in QuickBooks:

• Create invoices in QuickBooks Self-Employed
• Create rules to speed up reviews in QuickBooks Self-Employed

Don't hesitate to leave a post below if you have any questions about using QuickBooks. I'll be around to help you out.