I think you are looking for something like this Add module to allow services to be invoiced when they are done (#9999) · Issues · Tryton / Tryton · GitLab and New invoicing method when selling both goods and services
I think you are looking for something like this Add module to allow services to be invoiced when they are done (#9999) · Issues · Tryton / Tryton · GitLab and New invoicing method when selling both goods and services