Apart from manually adding your proficiency and alert bonuses to the Initiative Bonus field under settings on your sheet (assuming 5e OGL) and then updating each time your PB increases; If you go to your Attributes & Abilities tab and type this in the initiative_bonus field: @{dexterity_mod}+(@{dexterity}/100)+@{pb}+5 The (@{dexterity}/100) just adds your DEX in the event of tiebreakers. This will appear strange on the Core page, but the roll will work as intended. Otherwise, you could make an ability under the Attributes & Abilities page and add it as a token action for rolling using the same formula as above