Hi Bhatt,
Glad to hear that finally you are going toreward... 
Try to create new thread for your different issues, it will be better for all to post their views & also for new comers as well to search solution.
Anyways, solution on your Order header text copying to Operation text is......
Maintain Enhanced Object List Function as "Assignment of Operations to Object list Entries Inactive" under the node 'Define Notification and Order Integration' for the respective Preventive Maintenance Order Type.
This will solve your problem. Let me know if you have any quereis.
Thanks.
Amol