You can get the symmetry of the drawn elements according to the Y axis with the Mirror Y command. You can use the Mirror Y command when drawing doors/windows and stairs.

Location of Mirror Y Command

You can access it from the door/window toolbar.

You can access it from the stair toolbar.

You can access it from the home tab of the architectural program, under the heading of concrete.

You can access the concrete tab in the static program from the concrete heading.

Door before mirror Y

Door after mirror Y

Stair before mirror Y

Stair after mirror Y