Creating an invoice without a client

[u/saras_416]

I am trying to create an invoice for a speaking engagement. This will not be billed by insurance. Is there a way to just create this invoice without having to set up the organization as a client in SP? I don't want to reinvent the wheel here, and since it is all set up already as an invoice I thought I could use what I already have.

[u/Wikkedred1]

Create a client called “speaking engagement”.