Load a sample file in Power BI desktop.

Import Power Slicer from Market place:

Create a Line chart for Order Date and Profit, select Sub category under Legend option.

Select Power Slicer visualization > put Category, Sub Category fields for Values field:

Go to Format option:

Select few values from slicer:

 Check option under Type Selection> Select Tree type:

Select few values from Power Slicer:

Add one more dimension in power Slicer> select Region

All dimension set in tree type

Select multiple dimensions from Power Slicer:

Power slicer is useful Custom Visual for selecting multiple dimension.