POs Purchase Orders linked to the customer/ job not the contractor/ supplier

When an estimate is completed this then gets transferred to a PO for the relevant supplier, from the Customer/JOB. This PO should be also linked to the custmer/ job, where it comes from, so when you are looking at that Customer list/ Job - All Tansactions, you can see who was assigned to do the work and what POs have already been sent out for that Job. At present you have to search for it via the supplier. This should all be linked to the Job in question. You have Sales orders, but not POs available on the all transaction list of the Customer/ Job.