Amazon Personalize Recommendations on Subset of Items

I am playing with AP to build a recommendation system and have a question that I am unable to find answers anywhere.

My interactions dataset and items dataset contain several items. But I want the recommendations only on a subset of products. While this can be handled using some postprocessing steps, can I just provide the data for the products of interest in the items dataset and get the desired result without any performance implications?

Any advice will be appreciated.

Thanks.