Ideas for simplifying the work order task management process

Sounds like a relatively simple case of implementing a workflow where each task has its own workflow state with corresponding assignments to operators and approvers. If required you can use electronic signatures on approvals. Rather than adding your stamps on to the word document one at a time the process will be documented in metadata on the work order object. It is possible to automatically insert dates and user information from metadata into the word document. It will not be as stamps but as clear text. But that should be OK as long as you provide a signature and stamp at the end of the process to vouch for the validity of the data. PDF processor could easily add that for you. If required you can also use PDF processor at completion to append all the metadata and signatures to the document.

Some organizations choose to place their stamp and signature in the document template so that it is there from the start because they trust the system and their users to fill in the metadata correctly. Should they fail to do so the history in M-Files will reveal who has done what and when. In that case it will not be required to use PDF processor, a simple conversion from Word to PDF is sufficient as the last step in the workflow.

That is some good idea. However, If I have 30 tasks, then I would need to create 30 workflow states. Is this considered as a good practice ?

Rather 30 tasks with a single workflow which has 4 states, you could group the tasks under a process object..

Sorry. I don't really get your point.

If I look at your table I would create 30 task objects and give them the same workflow with states according to your stamps..

I am doing something like this..

Lets say we have 3 tasks. Each task has its own corresponding approval assignment for operator & inspector. 

Is this something similar to what you've stated above ?