ADDING DRAFTS TO A PART

HI,

IN THE ATTACHED PART, I NEED TO ADD A 3º DRAFT TO THE INSIDE WALL, ALL AROUND.  I ROLLED BACK TO THE BEGINNING AND ADDED THE DRAFT FROM THE FIRST EXTRUDE, BUT THE REST OF THE FEATURES DO NOT APPLY PROPOERLY.  SO MY QUESTION IS, WOULD IT BE EASIER TO START THE ENTIRE PART FROM SCRATCH WITH THE DRAFT ADDED FROM THE START OR IS THERE AN EASIER WAY OF HANDLING THIS??

THANKS!

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