Getting your bees to draw comb.

https://carolinahoneybees.com/encourage-honey-bees-to-build-comb-5-tips-to-improve-success/

If you use all undrawn plastic frames in a super, most bees will develop brace comb that will connect two frames together or will develop a new foundation that is a bee space away from the plastic. Shake the bees off those frames, cut out the unwanted beeswax, and spread out the honey and beeswax over the effected area. This procedure has the same effect as spraying the foundation with sugar water or coating the foundation with beeswax. It is recommended to spray sugar water on the plastic foundation when putting it into the hive to get the bees on the foundation.

https://www.beeculture.com/back-basics-foundation/