How do I add more custom addresses to this list on an invoice line via SuiteScript?

Edit the customer and add the address to the customer's addrrssbook sublist

I don't want the address to save to the customer. When using the

- New -

option, it saves to the customer, but when using the

- Custom -

option, it only saves to the invoice.

If you want to use the Custom Select option, then you need to get the shipping address subrecord from the item line and set your address there

Okay, I'm sort of on that track. I just don't know which fieldId to use to get the subrecord.

Load an existing invoice that has the subrecord set and log that record

Log the invoice record?

Correct