Unfortunately there isn't any feature built in to Mint for tracking expenses across 2 Mint profiles. I apologize for any inconvenience this may cause, and I understand how it could be beneficial so I've tagged your post as a feature request. This way the developers can see it for future consideration.
There are 2 options I can offer here: first, you could simply combine all of the accounts (yours and your partner's) into one Mint profile. This will make it easy to see everything in one place, and set budgets to track expenses across all categories. You can add one person's accounts to an existing profile or combine both in a totally new profile, but either way you'll be starting over fresh with at ;east some of the accounts so you'll be starting with the past 30-90 days of transactions for those. Unfortunately there is no way around that in this scenario.
The second option would be to figure out how much you want each budget to be, and then split that in half (or whatever percentage split works best for you). Then just apply that amount to a budget on each Mint profile, and that way you're each seeing your portion of that budget. Say you only want to spend $400/month on groceries, you can each set up budgets for $200 (or one for $100 and the other for $300, etc) to ensure that you don't go over between the two of you. I hope this helps!
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