# Filing GSTR-6: Add ISD GSTIN

In Octa GST, the modules available for a company depend on the **registration type** selected while adding the GSTIN.

If you add a GSTIN as **Regular**, Octa enables the regular GST modules for that company. Additional GSTINs under the
same PAN can then be added as regular registrations.

If the organization also has an **ISD GSTIN** under the same PAN, add it separately and select the registration type as
**ISD**. Once the ISD GSTIN is added, the ISD module becomes available for GSTR-6 related work.

## Add an ISD GSTIN

1. Go to the company creation or GSTIN addition screen.
2. Enter the ISD GSTIN details.
3. Select **ISD** as the registration type.
4. Save the company or GSTIN.
5. Open the newly added ISD company to access the GSTR-6 workflow.

> **Warning:** If the ISD GSTIN is added with the exact same company name as an existing company, Octa may show a **company already
> exists** error. In that case, create a separate company entry for the ISD GSTIN and use a slightly different company
> name, such as adding **ISD** to the name.