CoreData GroupBy and Sorting with different elements

I have a core data,

Entity:
Name Service Time

I am grouping this with the name

Now I am sorting this with the Time

Entity 1

• name: A
• Service: S
• Time 1

Entity 2

• name: A
• Service: S2
• Time 2

Entity 3

• name: B
• Service: S3
• Time: 3

after grouping What will be the time and service for grouped entity of fire two?

Grouped Entity

• name: A
• Service: ????
• Time: ????

Entity 3

• name: B
• Service: S3
• Time: 3

Is there Any property in core data to specify this