Hi
Thank you for posting the thread on our forum.
Based on your description, if you mean that in another presentation ,there have one more 100 slides, and you can't scroll past slides 100 to select the later slides to insert, such as slide 101, or slide 102?
- May I know if my understanding is correct? If so, we did a test in our end with PowerPoint. We try to reuse slides in another presentation with 108 slides, but when we scroll to 100, it stopped, we can't scroll to the later slides. We can reproduce your situation.


- So as a workaround, we suggest you can copy the later slides as a copy of a presentationo, then use the reuses slides to insert them. Or you can copy the slides to insert in the new presentation.
- We noticed there have a similiar thread and still not have a best solution, you can refer to Reuse slides limited - Microsoft Community
- Meanwhile, we suggest you can send your feedback to PowerPoint · Community (microsoft.com) to post your questions, , which is the best platform to let us hear from you and make our products and services better for you and others.
Your understanding and patience will be highly appreciated!!
Best regards,
Stacey