Here's what I ended up using: (by example)
C:\Debuggers\symstore.exe add /f C:\Users\marcusl\Desktop\ieframe.pdb /s C:\symbols /t ""
Question
I have a set of PDBs and I want to store them in my cache so that they'll be available to various tools (windbg.exe, wpa.exe) and so that I know they'll be backed up somewhere, rather than risk overwriting a PDB that corresponds to an important ETL trace that I took the previous day. It's easy to use symchk.exe to pull a PDB into your cache, but I want to push my own PDB into it.
There's gotta be a quick easy command with some debugging tool that does this.
La solution
Here's what I ended up using: (by example)
C:\Debuggers\symstore.exe add /f C:\Users\marcusl\Desktop\ieframe.pdb /s C:\symbols /t ""