I doubt that there is bus going to Subang from Seremban. Plus, you didn't inform here which area of Subang are you heading to.
What you can do is, take Train (Kommuter) from Seremban to KL Sentral, and from KL Sentral, you can change Kommuter to Subang Jaya (The one heading to "Pelabuhan Klang"). Or, at KL Sentral, change to LRT, go to Kelana Jaya. It's not far from Subang Airport.
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