Opening an existing model

On the Database menu, click Models. The Model window opens.
Click $image\list.gif$ and select the model you want to work with.
Click [OK].

When you click on a line in an existing model, Estimating refreshes the current variables from the items and assemblies in the database. If it encounters any changes made to the database since you last loaded the model, it asks you if you would like to run Check Model.