Hi went over the documentation and could not find any mention on how to do it.
The only thing i found is this - which i don't think match your question exactly, but still give it a try to see if its working or not. :
When you click on Detected Changes
in the Team Explorer pane, Promote Candidate Changes
window opens.
This window allows you to select among detected changes and promote them to a source controlled item.
In this Promote Candidate Changes
window, you select a file (or multi select files with Shift), right-click on it and a context menu pops up which contains an ignore this local item
option.
If you you click on it, selected files are excluded from source control.