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Thank you for posting this idea. Yes it is true that during the development of a project a member that has been assigned a beta angle may need to change or removed altogether. As I am sure you appreciate, the BETA command is an instruction to rotate a collection of members to a given orientation, so the question is when it comes to modification the designer might typically want to do one of two actions
1) Change all the members assigned the beta angle to a new angle. That is achieved by double clicking or editing the BETA command in the Properties dialog box and assigning a new value (even 0), then all these members are modified. If a beta 0 is required on all the assigned members, the command can simply be deleted and the default of zero is applied.
2) Change one member of the assigned list. That is achieved simply by doble clicking on the member in the graphical view to display the Beam Properties dialog (sometimes called the Member Query dialog) and on the Geometry tab, the assigned beta on this member is shown with a button to 'Change Beta' on just that beam, which can be to set it to zero, leaving all the others that were assigned that same beta command un-affected.
So overall this capability already exists.