Sub ID is a tracking parameter, which reflects the publisher in different verticals and shows where the publisher's traffic comes from.
Sub IDs are created automatically in PX platform when leads are inserted. However, if you need to edit publisher's sub ID, go to Admin -> Publishers, find the desired publisher and click Action -> Manage Sub IDs:
On Sub IDs Management page, find the desired sub ID and click Edit:
A new page appears, including three sections similar to Publisher Settings, with an additional No Parent Inherit field.
By default, leads are inserted with No Parent Inherit set to No, which means that publisher settings (Margin, Min Price, Escore Check Percentage, etc.) are not inherited by its sub IDs. If you want changes in publisher settings to be always applied to all sub IDs, set No Parent Inherit to Yes and click Save.