There are two symbol dictionary files in the current version of MultiCharts:
Dictionary.csv - for older versions
Dictionary.ucs2.csv - for newer versions
You can do the backup/share of the symbol dictionary files or change them manually.
The files are located in the MultiCharts data bases folder
Please keep in mind that all manual changes are performed at your own risk.
Unfortunately there is no "Clone symbol root" feature in the QuoteManager at the moment.