There are two ways to do this
From within a project
Go to the Project’s Edit Strategy page
Use the Strategy dropdown list to find a strategy
Press the Add Strategy button
Press Save Changes
You arrive on the project’s targets page which now contains rows for each of the Progress Trackers that were in the Strategy template you added to the project
Scroll to the bottom and press Save
You arrive on the project page
From within a strategy template
Go to the Strategy page
Select Use this Strategy
Select the project
Press Save
The Outcomes & Progress Trackers within the strategy have now been added to the project(s) you selected