Workflow 3: Merge, Copy-Paste, or Send/Receive ARCHICAD Project in an MEP Modeler Environment
If an ARCHICAD project is accessed in an MEP environment without using File > Open (e.g. merging the file; or copy/pasting MEP objects; or accessing such objects through Teamwork’s Send/Receive or Reserve functions), then the MEP-compatible GDL objects will not automatically be converted into parametric MEP objects, as they are in Workflow 2.
If you want continue working on this project using MEP Modeler functions, you should achieve this conversion manually: go to MEP Preferences and click the Convert Objects to MEP Elements button.