Hi,
A possible option is to manually reference a common Namemapping file from all your test projects.
Steps:
-- Exit TestComplete;
-- Create a backup ;) ;
-- Create (or choose) a folder for the shared NameMapping file;
-- For every project (.pjs) file, open it in the text editor, search for the 'NameMapping.tcNM' string, replace the relative path with the new relative (or absolute, but this might be less portable) path to the shared folder and save the changes;
-- Open test suite in TestComplete. If the shared folder is located outside of the folder where the given project file is located, a small 'shortcut' glyph should be added to the Namemapping element for this project.