Asset Category in Purchasing

Hi,

We want to pass 'Asset Category' (major/minor category) and Asset Book from Purchasing to payables so that mass additions can pick this information for capital purchases. Inventory is not installed so we don't have items. Purchase categories have been setup to create PO's and requisitions. In payables we have Asset Category and Asset Book as fields at line level. But in Purchasing we don't have such fields. How can we pass this information from PO and requisitions (iProc) to Payables?

Thanks