I´m new in programming and got the task to find a way to solve this issue with a macro. In the best case, a message should appear first as to whether this property already exists and, if not, the macro should start and insert the property on a defined place. In new drawings this user-defined propery is already added, but if an older drawing is opened this property should be added automatically. Also for Could you give me any help?

Thanks in advance!

Martin