power bi report based on multiple semantic models

You can use more than one Power BI semantic model in a single report, but there are two different scenarios:

1. Same report with multiple models,

You can connect to Model A and Model B and use visuals from both in one PBIX. However, the models stay separate: you generally can’t relate tables across them, and slicers/filters from one model usually won’t filter visuals from the other model.

2. Truly combining models, 
You may be able to use a composite model (DirectQuery for semantic models) to add a second model and create relationships/combined measures. This depends on tenant settings and can introduce limitations such as performance, restricted modeling features, and more sensitivity to changes in the upstream models.

You will need permission to all underlying semantic models. If upstream models change (rename/remove fields), your report can break. Also, cross-model filtering and “single set of slicers” is not automatic unless you implement an integration approach.

If your end goal is a single, consistent reporting experience, the most reliable approach is usually to build a combined semantic model upstream and then build reports from that one model.