Categories in TDM are used for objects of model, not for their graphical representatives on WS (shortcuts). If you wanted to use them for shortcuts, the purpose of categories would change. I guess, lots of customers will not like it.
You write that the same table can have different roles on different WS. Let me ask you what you mean by the role. Do you mean a graphical display of the table? (If so, you can change the table format on the WS.) Or do you want to work with the particular entity in a different way on different WS? Thanks for your explanation.
Export/import categories - we will not include it among Dictionary items. Category doesn’t belong there. However, it could be an item in something like repository or gallery. CR for this already exists - CR 33 752. Unfortunately, I’m not able to tell you when we will deal with this task.
Workaround: You can easily copy Categories among models - between Model Explorers of the two models - CTRL+drag&drop.
Vladka + TDM Team