Hi FCA1980,
It's great to have you here in the Community Forum!
If you need specific third-party programs that can integrate with MYOB for job costing in the sign writing and production business, I would highly recommend checking our MYOB App Marketplace. It might have programs that can integrate with existing software, which could potentially include third-party programs used by your clients.
Feel free to post again anytime you require further assistance.
If my response has answered your inquiry, please click "Accept as Solution" to help other users find this.
Kind regards,
Shella