Close the form.
Refresh the data in the form. The data may have changed after you opened this
form because (1) you changed the data in another form, or (2) in the Enterprise
Version only: the data was changed by another user.
Open data record for editing.
Create a new structure by copying the selected structure.
Add a new overhead structure type.
Delete the selected record from the database
Create a Line Table File with extension .LTB for all the structures in the
library. The Line Table File is used by OneLiner and DistriView
for modeling lines.