This topic may be old, but I think this solution is good enough
Use "Working set" feature to group files/folders you need into a working set
Create a working set
- Open a view like Project Expoler, Navigator or PHPExplore (if you
have PDT) or Package Explorer (if you are a java coder)
- Click "View Menu" (small triangle icon) at top-right of the view opened
- Select "Select Working Set..."
- Choose "Selected Working Sets" option
- Click button "New"
- Pick a type you need, click next, give it a name (eg: MyBookmark) and choose any
project(s)/folder(s)/file(s) shown under "Working set content" to include in MyBookmark and finish
Open/edit/close a working set
- To open a working set (MyBookmark), follow steps 1 -> 4 above and
check the checkbox named MyBookmark, click OK. Now the view display only contents of MyBookmark
- To edit MyBookmark contents click "View Menu" and select "Edit Active Working Set..."
- To close current working set and back to original display click
"View Menu" and select "Deselect Working Set"