It will simply say “Add half o the butter (100g)” and you have divide it yourself. It’s very simple.

BUT

Some recipes will have the same ingredient multiple times like:

Filling:

- 100 g sugar
- 50 g butter 

Dough:
- 500 g flour
- 100 g butter

and the app will distinguish between them and put the correct amount in the correct part of the body.