I like to use these GM tabs to replace the need for pen and paper to track things. But if you are playing in meatspace it's less necessary. In my pendragon sheet, I have the GM sheet as separate from the PC sheet, so you can have multiple set up as different characters. Creating one sheet per adventure, to store notes and likely needed rolls for that adventure is very handy. If you just want to add it as a separate tab visible on the player sheet, that'll work fine, but they really dont need to see it, unless you set it up as a space for them to keep notes, too. But thinking about what a GM might need, and doing a bit of brainstorming, I think something like: Adventure or Session Notes/Reminders: repeating section of textareas, where GM can jot down things they need to remember, or make notes as the session progresses PC Details: a repeating section with an input for pc name, and a textarea for notes you need to remind yourself or any statuses that apply, etc Ad-hoc Rolls: a repeating section with several inputs, and a roll button: text input: name/source of challenge, number input: rating of thing, Button: roll displaying the name/source/nature of the roll, and the roll result. Quick NPC section: this is trickier to design, since it should be a repeating section, but you cant nest repeating sections insider each other, so you'd have to decide how many skill/ability slots are going to be standard. Personally, I skip this one, and use the adhoc roll section for quick npcs, splitting that first input into two: name, skill so it displayers properly when rolled. You might not need to do that. With these sections, GMs can keep a lot of information readily to hand for the ongoing session, can add reminders as the session progresses and delete them as they aren't needed any more. This works great for games were you have a lot of mook level monsters where you only track one or two skills and dont want to create proper character sheets for each, or need to make rolls that aren't associated with a character.