Series Bundling is used to offer certain retail items to customers when purchasing a particular Series or Contract. An example of this is offering boxing gloves with the purchase of a series.

Navigate to Admin > Scheduling/Retail > Categories. Select Edit for the Category that contains the item that you want to add to your series for bundling. Toggle the For Series Bundling setting to Yes.
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Navigate to Admin > Scheduling/Retail > Series/Contracts. Edit the series you wish to benefit from series bundling and expand the Purchase Options/Restrictions category. There, in Bundled Products, you can select which products will be offered.

The products will be available for selection on the buy page directly under the listing of the series. Customers will need to select the item they want to bundle with the series and the item will be added to their cart whenever they check out with the series.