Group relief

The carried forward losses can be surrendered only to the extent that it cannot use against it’s own total profits of current year.
My doubt what there is also current year loss
Example
Trading loss 15000
Other income 45000
Carry forward losses 60000
Now what is the extent for group transfer
1) 45000-15000(suppose current year claim made) , so the rest 30000(60000-30000) OR
2) 15000(60000-45000)