I am sure this one will help many.
if you want to differentiate each test in order to mange tractability in the requirement.
Here is how it works:
1. Go to Tools -> Customize -> Customize Project Entities.
2. Here under Test, create a new user defined field and call it Test ID (say for example
3. Go to Setup workflow -> Script Editor. Here go to TestPlan_Test_MoveTo and put the following highlighted code:
On Error Resume Next
Test_Fields.Field("TS_USER_01").IsReadOnly = true
On Error GoTo 0