The screen 'Library > Value Set > Manufacturer' is used to create a list of manufacturers which you would like to use in your projects.
Press
button. (Or use right mouse click > new)
Select the manufacturer you want to delete from the list
Click
button. (Or use right mouse click > delete)Click
in the message dialog.
When an manufacturer is the active selection for one or more manufacturer groups in your project another message is shown:
This message lets you know that the selected manufacturer is the active selection in one or more projects (project specifcation > manufacturers).