There was some wood rot on the garage door stop on one side that went up about 6 inches. Some sort of fancy trim profile which could be hard to find or costly. I looked it over and decided not to replace the fancy trim but to leave the trim and cut off the bottom section at 10 inches high. Done the other side up to 10 inches to make them uniform in appearance. Took a piece of 1x6 I had purchased from the bargain bin at Home Depot and cut it to the width of the trim and 10 inches tall and nailed them under the trim on both sides of the garage door trim. Painted those pieces of wood and that was it for that project.

The pieces I installed are called plinth blocks. They look just fine like that.