How to run a single pipeline within a mapping?

There is no solution in informatica for run paricular pipeline in mapping... session will execute complete mapping not an single pipeline ... so better to create new mapping for middle pipeline...

In designer.
Select mapping tab
There is a property target load plan
Select the source qualifier and the target which u want to run the first n place it in first position. Followed by other pipelines

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Example; If we have two pipelines in a single mapping then whichever pipeline you do want to run just add 1=2 in the SQ override as a last statement.And create two sessions for the same mapping and add this statement to the SQ of one source which you don't want to run.It will run the other one.