Hello @fixait,
Yes, that is possible with our Professional extension. Please email us at support@wpovernight.com, as we are forbidden from providing support for paid software in these forums. 🙂
For those who wonder about the scope of support on custom numbering systems (when you need two or more separated numbering for the same document:)
By default, our plugin only provides a number sequence per-document. However, it is possible to create one or more alternative custom numbering sequences with some PHP code.
But please note that since working with this kind of customizations is a bit complex, we can only offer limited help for basic setups (hard-coded, with no settings) when you have a license for Professional extension or Premium Templates, or as a custom job with a fee, if you need the same settings of our main invoice numbering for your custom numbering system.
Finally, as my colleague Darren said, we manage these request in support@wpovernight.com, so please contact us there if you need help or have more questions.
