Hi Stephen2024,
Thanks for your post, and welcome to the MYOB Community Forum.
Cost centre is for the whole transaction while jobs is for each line item in the transaction. However, to add a cost centre to each transaction processed, you will need to manually edit it. To do this, you can go to Sales > Sales Register and then select the transaction you wish to edit > Select the cost centre.
Feel free to post again anytime if you require further assistance.
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Best regards,
Doreen