We have fields created on the sales order that hold a customer’s third party shipping account information, these autopopulate from the customer’s account. I am trying to figure out how to use a multiselect field/list (or something of the sort) to be able to select from when a customer has multiple shipping accounts (they designate on the PO which they want to use at that time) . When the different account is chosen, I want it to change what populates into the current created third party shipping fields (carrier, account #, billing address, ect… ). Can anyone explain to me how to make this happen in layman terms?

Depends on how you've currently got it setup, I'll layout my presumptions and potential solution. • I presume all the 3rd party ship info are entity/flat fields on the customer record, as opposed to being in a custom record. • I'm presuming also that the 3rd party ship info is unique to each customer • I'm presuming there isn't a 1:1 relationship between the customer's 3rd party shipping account/info and their shipping address(es) (it's simpler if this is the case)