I am not sure that BPT user guide is available in QTP8.2. It is available in 9.x series though. Also BPT userguide has around 800 pages. I would suggest you to get hold of it and go thru it.
Business Process Testing: It has been designed so that QA and business teams can work together throughout the testing process, regardless of levels of technical expertise. Automation engineers will work together with subject matter experts to create business process tests. Subject matter experts use the business components module of Quality Center to create business process tests, using resources(Objects, function libraries, etc) created by the Automation engineer.
Business Process Testing: It has been designed so that QA and business teams can work together throughout the testing process, regardless of levels of technical expertise. Automation engineers will work together with subject matter experts to create business process tests. Subject matter experts use the business components module of Quality Center to create business process tests, using resources(Objects, function libraries, etc) created by the Automation engineer.