Currently we can not annotate the grade difference on the profile parabola,
We can use the Item types to build a expression to calculate the grade difference and then use the civil labeler, but this workflow works only if the profile is not complex.

If we create the complex profile, we can not attach the item type only to the particular parabola. and existing item types stops working if we create the complex profile.

I think its because Item type is reassigned to the complex element so Parabola element loose its item type property.

The Grade difference is required for a Spanish Rail.

At present, for the profile we need to submit to the Rail administration, we must manually calculate each value and enter it.