Question about PM schedule

Hi,

We could carry out oil sampling 100 hrs. before the service is due.

Thought about scheduling this with the servicing to generate 100 hrs. before but can’t find a solution.

 

Is there a way of aligning the dates when the service is completed to when the next service sample will be due?

 

Is there a way of running a schedule against a virtual meter 100hrs behind the original?

 

Then again how would this link to when the original service was completed.

 

Thanks in adavance for suggestion/solution.