Go to: Models tab>select model under Model Name>Data Sheets>Edit
You can edit and change the file you added to the catalog for any data sheet for any of the data sheet types.
To edit a data sheet:
From the [your model] Data Sheets dialog box, click Edit.
Click Browse in the New Attached File column to locate the file you want to associate with the Data Sheet.
If necessary, repeat to add a file to any additional Data Sheets.
Click Save.
The <your model> Data Sheets dialog box is displayed with the new information.