Hi there,
I'm using Arc GIS pro and I have been attempting to use the calculate field to organise these 'Broad Habitats' into their 'Aggregate Class' - so simplifying them in a way.

I created a new field within the attribute table and attempted to calculate the field. I thought I should add the 'Broad Habitat values', and then equal it to the 'aggregate class'. This screenshot below shows how I attempted this with the Semi-Natural Grassland 'Aggregate class'.

I added the 'broad Habitat' values together, but I got an error sign when attempting to apply it. any thoughts where I went wrong and how I can solve this issue? Am I on the right track?

Any help would be appreciated 🙂