We decided to cut a second doorway into our formal dining room which would help open up the room plus make the house feel larger and roomier. Here are some pitures of the process.
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(1) from living room (2) from hallway (3) inside dining room

(1) drawing arch (2) cutting through drywall (3) standing under arch

(1) new doorway (2) from dining room (3) close-up of arch

We also added a second arch over the previous doorway

This is what it looks like finished

(1) view from front door (2) from hallway (3) from dining room