You can't locate parts AND assemblies (if they are different levels) in SolidWorks by keeping the properties. It will necessarily be a simple text for one of them!
If I understand your problem correctly, you have an assembly with a sub-assembly inside.
and you want to identify the components of your sub-assembly.
If that's what it is, to insert a view of your subset in your drawing (on the outside it will be to be hidden afterwards so as not to pollute the print). This will normally have the effect of loading the component references into memory, and thus you will be able to locate the parts of your sub-assembly.
We use this technique in our company.
Hoping to have understood and solved your problem.
To retrieve a property of a subset in a note you have to hover over the origin of the subset (display the origins in the display menu) when snapping the note ... It's the only place that allows you to recover a property of the sub-assembly and not that of one of the parts that make it up!