If you have multiple customers operating from different locations but using the same GST number, you can add them separately in the Customers section based on their individual locations. You can use the same GST number for each entry and specify the different addresses under the shipping address section. This approach simplifies the process of creating invoices for each location.
If you want to view a combined ledger for all the locations of the same customer, you can use the option to group the ledgers.