PM - Number Ranges

In Plant Maintenance ,

List of Number Ranges,

1. Create Number Ranges for Measuring points - IK09

2. Create Number Ranges for Measurement documents - IK19

3. Create Number Ranges for Object links - IN20

4. Define Number Ranges for Maintenance Items - IP21

5. Define Number Ranges for General Maintenance Task lists - OIL4

6. Define Number Ranges for Equipment Task Lists - OIL5

7. Define Number Ranges for Task lists for Functional Locations - OIL0.

For the above number ranges there is no possible to maintain Groups. If it is possible, suggest how to maintain groups for differentiating number ranges for different plants.