The "map this service on its own" checkbox
When you add a service, the intake includes a checkbox labeled "Map this service on its own, without considering my existing workflows". It changes how the new service is planned, and it is worth understanding before you check it.
What it does
Checked, the new service is mapped in isolation. Your existing workflows are left untouched, and the new service is drafted without seeing what you already have. It runs faster, because nothing is re-planned.
Checking the box reveals a warning, and the warning means what it says: expect some overlap. A second onboarding workflow, a repeated email, structures that duplicate what already exists. Those overlaps are yours to reconcile by hand, because the plan never looked at your existing system to avoid them.

The cost is the same
One credit either way. The checkbox changes how the service is planned, not what it costs.
When to use it
Use it when the new service is genuinely separate from everything already mapped. A service with its own audience, its own process, and no shared phases has nothing to integrate, so isolation costs you nothing.
Otherwise, leave it unchecked. The full re-plan exists to decide where the new service shares your existing workflows and where it stands alone, and that integration is the point of adding a service to a business rather than mapping it somewhere separate.