ServiceTitan powers the Jobs and Revenue data in MLAP: job counts, booked revenue, and job distance.
ServiceTitan is connected once per organization, and the tenant is shared across your account. Create the tenant and API credentials on the ServiceTitan integration (you can also add it from MLAP Settings > ServiceTitan > Tenants - it is the same tenant either way). What MLAP adds is Linking: on the Linking tab, map your ServiceTitan business units and campaigns to the matching MLAP locations, so jobs and revenue attribute to the right place.
Once connected and linked, ServiceTitan data flows into each location's Jobs tab, Revenue Correlation, and Job Intelligence.