Alot of ways to accomplish what you requires. Commonly, you just need some place to store the action user currently doing.
Managed Bean Facility would be a good place for this. You can define a managed bean that contains the flag that indicates the activity user currently engaging in.
Then, using the value from the bean you can customize the presentation of your JSF components. For example, almost all JSF HTML component got a rendered attribute that you can set. There is also readonly and disabled attribute for input components.
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