Hi DeanB, welcome to the forums. Custom fields can be shared with other VueMinder installations, but not by syncing with Google Calendar alone. Basically, you'd need to install MySQL Server on one of your connected computers and then configure each VueMinder installation to connect to MySQL Server for sharing custom field definitions. instructions can be found here:
http://www.vueminder.com/sharing.phpYou don't need to configure your existing calendars to be shared through MySQL Server. You can continue syncing the calendars through Google Calendar. The only thing MySQL Server would be used for is syncing the custom field definitions. You should then see the same custom data on your other VueMinder installations.
Another (low tech) option would be to open the VueMinder data folder (the location can be found in the Program Options) on the computer where the correct custom fields are displayed. Within that folder, there's a file named "CustomFields.bin". Copy that file to the data folder on your other VueMinder installations, replacing the existing file. Make sure to exit VueMinder prior to copying the file. When you restart VueMinder, you should see the same custom field definitions and custom data within events. However, if you create any new custom field definitions (via the Tools menu), you won't see the new fields on your other computers. You'd need to re-copy the file. Going through MySQL Server is the preferred approach.
I hope that helps. Please let me know if you have any other questions.