Hi BC.
Some time ago i have the same question.
You assign status management to the order type, you see the status management box in KOT2_OPA. But new order types dont have this box.
You click the Order Status Button, and the the assignment. The following dialog box apear:
In the help, you see this info:
Use the general status management
Message no. KO808
Diagnosis
You want to maintain the order status for order type 0600.
Order status management is to be removed from general SAP Status Management.
Note
From Release 6.00, it is not possible to edit the order status. You can only display order statuses that have been edited.
Order status management is only available to display orders that were created with it in earlier releases.
System Response
You can switch to order status management if the order statuses exist.
Procedure
Create new statuses with general status management.
Convert order types whose order statuses are maintained by using the RKOSTAT1 report. Convert into orders that use general status management.
For orders whose statuses are sequential, use the RKOSTAT2 report to convert them to orders that use general status management.
Recommendation
Use general status management.
See also:
If you click the TICK, you can see a the transaction groups, but cant modify, according to the message i just show you. No longer possible to use this functionality 
This is my screen of KOV2 Transaction groups.
Arturo