Can I adjust the inventory of bundles directly in Sumtracker?

No, the inventory of bundles cannot be adjusted directly in Sumtracker.

Bundles are virtual products — you don't actually hold bundles in your inventory. What you hold are the individual component products. Because of this, a bundle's inventory is always calculated automatically from the available inventory of its components.

If you need to adjust the inventory of a bundle, adjust the inventory of its component products instead. The bundle's available quantity will update automatically based on the new component stock levels.

This is also why the inventory report only shows components and non-bundle products. To view bundle inventory, go to the Bundles page, where Sumtracker shows the calculated available quantity for each bundle based on its components.