Are you talking about merging the attributes on the front-end (meaning you want to display it on a page as a heading) or on a database level?
If you want to combine it on a database level you have 2 options:
You can either:
Using a microflow you can then change the object and combine the attribute values
Hey, you can use calculated column and use microflow to create return value for that column. https://docs.mendix.com/refguide/attributes/#232-microflow