1. We are aware SLA's are for customers. In our case, we want to use the SLA for ourselves.

The issue is that we are unsure how to best accomplish this given how we have set up service desk plus.

Suggestions are appreciated.

First, ticket comes in and is created by support desk. (there is no SLA here)

All tickets by default are created with medium priorities.

then SD may work the ticket for a day or so, then assign over to another team for them to do their part.
However, that team, has a two day sla to resolve

The issue is that by the time the ticket gets assigned to the Other group, it may already be in SLA violation because the SLA starts by ticket creation date.
So if the ticket is manually assigned to group two and the ticket is three days old, then it starts out in violation

So, my question is, how can we get around this? We want the SLA to begin when it is assigned to that other group.

We have two other groups SD assigns tickets to: Applications and Systems

Perhaps using some combination of resolved instead of closed with the timer turned off?

The issue with creating an action saying if this doesn't happen by this time then automatically assign to tier 2 etc is that sometimes a ticket may need to go to one group, other times another group.