There are methods to transform a particle set:
Go to the start frame when the particle set begins move or rotate. Select the pivot of the particle set.
In the Modify page, change the Move/Rotate values in the Transform section. A new key is added to store the transform status of the set.
You may also drag the gizmo by using the 
tool or
transform
Gizmo to set a key for particle set.
Go to another frame when the set stops transforming. Change the Transform values again.
Go to the start frame when the set of particle begins move along a path. Select the pivot of the particle set.
Click the Pick Path button in the Path section and click on the desired position of the target path.
Go to another frame where the particle set stops moving along with the path.
Click the Pick Path button and click on another position of the target path where the particle set stops moving.
* Please refer to Path for more information.