EXPERT RESPONSE
Typically the 'sold to party' cannot be changed on the sales order. But user exits are available that can enable you to change certain fields. This can be accomplished by using the an user exit in the PAI of the appropriate screen. You may need the help of an ABAP consultant, but generally speaking, you may need to do a loop at sceen.
if screenname = "<SOLD TO PARTY>"
modify field "<SOLD TO PARTY>"
endloop.
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