How Can I become a Certified Purchasing Manager? is there any professional and certified online courses?

There are several certification programs available in Procurement and Supply:

1.   Chartered Institute of Procurement and Supply (CIPS) certification

2.   Strategic Supply and Procurement Management(SPSM) certification

3.   Certified Purchasing Professional (CPP) certification.

 These are certification program with several levels; you can look into their website for further details. CIPS is quite popular and well known in Asia and Africa.  You have to be registered for the courses, study on line and then and sit for examination.

try this website : www.nextlevelpurchasing.com

it has alot of good & valuable knowledge

You can go for Certified Purchasing Manager (C.P.M.) Program