1) Place a VAV Box and draw duct from the Supply opening, making sure you include a fitting. I selected to simply decrease my Supply Duct from a 12" x 12" Rectangular Duct to a 10" x 10" Rectangular Duct.
2) Select the Fitting. In the Add-Ins tab, there is a Select Table button, that will allow you to see the different Fitting options. If it is incompatible, it will ignore the change, so make sure you are selecting a compatible fitting using the different Categories provided.
3) Once done, you will note in the Properties Pallete, that the ASHRAE Table value has been updated.
Note: You can also simply view the Fittings without applying them to your project:
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