Can users associate a paid retainer invoice to a project?

Can users associate a paid retainer invoice to a project?

I am new to Zoho Invoice. For a new client, I issued a retainer invoice, which the client paid. For the same client, I then created a project. I do not see a way to associate the retainer invoice (which has already been paid) with the project. From this page https://www.zoho.com/books/help/retainer-invoice/retainer-project.html, it looks like I must create the project first, then create a retainer invoice associated with the project. Is that correct?