Autonumbering outdent and indent separately

My outdents are initiatives and my indents and milestones and would like to number my outdents INIT001 and so on, and my indents to be numbered as MILE0001 and so on...though I dont seem to be able to do this. I've tried having separate columns for this also one for Initiative Number and one for Milestone Number but the autonumber is applying to all rows...hopefully someone can help


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