Hi,
50 pages is a lot to handle. The practicalities may depend on the number of options that the Reps have to consider.
One solution is Here: Re: Password protect subforms Stephen has a neat solution where the Reps know what inputs to put in to make a subform visible. This subform could contain fields for the name of the institution and checkboxes to make pages visible or hidden.
The institute name really depends on where the name is located. Is it in the object captions or object values? You can change both with script, but it will be much easier if the institute name is in the value of a field.
The first option to consider is to place the institute name field on the Master Page. This will then appear on all pages. Then select one location where the Reps will fill in the institute name and then set this binding to Global in the Object > Binding tab. Make sure that all of the institute objects have the exact same name. This way when the institute name is updated in one location, it will be automatically updated in all bound locations.
Hope that helps,
Niall