Do you mean if the user checks the checkbox then it should disable a number of fields? If you are using APEX 4 then you can achieve this using dynamic actions. If not then you will have to write an onChange() event and code it manually.
- Create a dynamic action that fires on change of your checkbox item.
- Define the condition as "equal to" Y (or whatever value of your checkbox)
- You True action would Enable your text field, and create a subsequent False action that disables it.
- You may enable this to fire this on page load.
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