Sales Entry - Customer PO Sort

we are currently using Sage Standard 2014 5.1 version.

We are loading Sales Orders using an EDI Translation software and MAPADOC.   The orders are loading into Sales Order by Customer #.

We have one Customer due to different divisions/vendor#s  sends their EDI combined for all divisoins, we then split them up into the 3 Customer No's (due to terms)

we load them, and Mapadoc loads them by Customer number order. ie.. C601, C601PR, C601RC .   

Due to the fact that we need to get their Packing slips from their WebPortal, which the packing slips can only be in PO order with all 3 vendor numbers inter-mingled.

so we load our orders into starship for all three in PO order and the labels and pack slips match up great.

We get alot of orders so we wanted to Batch these orders in batches of 250.

since we do not have a full integrated system with our shipping dept, we send out the orders in these batches and then they communicate to office when they are complete so we can go into Sage and Auto-Generate Invoices by each batch.

so the batches are in PO order but in Sales order entry they are broken up by customer number.

is there a way to re-sort the sales order entry screen for these customer numbers so i can auto-generate invoices by these three customer numbers combined in PO order??

Currently:

C601         PO# D0001

C601         PO#  K0001

C601PR    PO# A0001 

C601PR    PO#  Y0001

C601RC    PO#   B0001

C601RC     PO# E0001

++++++++++++++++++

wanted results:

C601PR      PO# A0001 

C601RC      PO#  B0001

C601            PO# D0001

C601RC      PO# E0001

C601            PO#  K0001

C601PR       PO#  Y0001