I am going to work on a model builder script run it in my desktop geodatabase, then I want to test it in a SDE development database and deploy it to an SDE production geodatabase. Is there a tool in Model Builder that allows to point to a specific geodatabase, instead of changing the properties of each feature to change the path to the feature class in the new geodatabase.
If you want to use a Model then, I can't think of any option other than what Luke has suggested. If you can export your model as a script then, possibly you can attempt below.
Attached script reads a variable file.
Below was the content of my variable file.