Hi All - I've recently created a custom field against Sales transactions in order to help filter out certain transactions necessary for a use case by the business. I'm hoping there's a way I can use csv import to update OLD cash sales and invoices in order to set this flag without opening each previous period since it's a custom field that doesn't affect the transaction value itself or GL in any way. Can anyone thing of a way to do this without opening past periods to do the update?

Investigate the setting “Allow non g/l changes” on the Account Periods. This is what allows you to update these fields in closed periods

Wonderful! I thought there might be something like this - thank you so much