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Can you change or operate on predefined Path Variable?



Let's say the CCS project is set up such that the pre-defined path variable PROJECT_LOC is D:/Tom/Jerry.  But I want to reference a linked resource located D:/Tom.

I do not want to hard code the path for portability.  Is there a way to use ${PROJECT_LOC} to reference it?  like an operator that can allow me to go up a level in directory.

PROJECT_LOC is smart and adaptive, because it automatically detects the path of the .ccsproject file.  I really want to anchor everything else relative to this path variable.  Thanks.