Affiliate sub IDs are a subset of parameters and macros used for non-unique values that don't correspond to any other parameters and macros. Affiliate sub IDs are used to store non-unique values from the publisher's tracking system, in some cases to forward to an advertiser.
Once a sub ID value is stored, you can provide it to your advertiser or publisher using the corresponding affiliate sub ID macro in an offer URL or affiliates conversion link.
Adding Affiliate Sub ID Parameters
Affiliate sub ID values are stored via the following tracking link parameters:
To add sub ID parameters to a tracking link, go to offer's page and find the Customise Your Tracking panel. Click Add Sub IDs and enter the sub ID value in the field that appears.