How do you arrange advance payments?

Yes, that is not possible at the moment.

I invoice the full amount and then in step 3 I add a comment that they can take the advance payment into account and ultimately only have to pay X pounds.

Same question here. Have you found an elegant way to solve this, SJ? I don't think mentioning it in the comment is ideal.

I have the same question. Because I work on a project basis, the amounts are always large for me, and I almost ALWAYS work with a deposit. I hope this feature can be integrated here soon!

I question an advance payment in the quotation comment, which I use as confirmation, and afterwards I deduct it from the invoice using the discount function.