Inventory>File>Purchase Orders>Select the Change Lines on a PO button located on the toolbar 
This selection allows global changes to specific fields on all lines of the selected purchase order. This option can speed up data entry because it is not necessary to click and select each line on the purchase order. The fields you may globally change are: Ordered By, Taken By, Promise Date, Reference #, Sidemark and Comments.

Only type into the fields you want to change. Blank fields will leave the existing information untouched.
Change all PO Lines
This option will make the specified changes to all purchase order lines on the selected PO.
Change PO Lines as Indicated Below:
Selecting this option will allow the selection of one of the options below
Same Supplier as Selected
This option changes the purchase order lines that have the same supplier name and PO # as the selected purchase order.
Same Product Code as Selected
This option changes the purchase order lines that have the same product code and PO # as the selected purchase order.
Change PO Lines where Status=To Be Ordered
If this option is selected, only the purchase order lines that are in the to be ordered status will change.
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