Audio to Create Tempo Map at measure 4

[sadicus]

I want a Drum Tempo to match an already recorded Guitar track.
When Drag/Drop to the timeline select "Automatic"
How to have the tempo map start at a different measure than 1?

Example

The beat of the the guitar starts at measure 4 but there are riffs and noise in the first
My thought is to just cut off the first part and bounce it to a new track.

 

[John Vere]

If the first few measures were recorded using say 120 bpm. Just go into the editor and change any events up to where you want the tempo map to start and enter 120 instead. 
Now the intro will play at original tempo up to where the tempo map kicks in 

Edited February 12, 2023 by John Vere