The location for tasks(mappings) for ALM/QC Excel Add-In is: %appdata%\Microsoft\Excel\XLSTART\TDAddin
Also in XLSTART folder the last connection to HP ALM/QC server can be founded in the file:
Regarding how to reuse the task(mapping) file, please refer to below instructions:
1. Copy the mapping file over from one computer to another
2. Locate ExcelAddin.ini file under task file location
3. Find [Tasks] section and add the mapping file’s filename (only the prefix before the dot ‘.’) to appropriate lines.
4. Save it and then start Excel again
Note: The suffix stands for the type of the mapping: .tst is for Test; .req is for Requirement; .bug is for Bug.