Door dynamic blocks servers multiple purpose with differect sizes in single object.
This video explains how to make a dynamic block door. for simplicity purpose i have used only linear parameters. you can also add flip parameters to adjust door according to situation.
You can also use inbuilt dynamic blocks available in autocad under design center.
About Dynamic Blocks
Dynamic blocks contain rules and restrictions that control the appearance and behavior of a block when it is inserted into a drawing or when it's later modified.
You can add these rules and controls to any existing block as well as using them when you create new blocks. The controls are limited to 2D operations only.