You can create a top surface from the virtual stacking.
Click Play to watch the video:
From the Solids and Top Surfaces from Plies section of the
action bar, click Top Surface From Virtual
Stacking.
Select the virtual stacking.
Select From Generated Plies.
The top surface matches the plies.
Click Compute Analysis and the required options.
A view of Iso-Thickness Areas (in green, with height), junction lines (in
white) and ITPs if any (in yellow) is displayed according to the selected
options.
Click Apply, then OK.
A top surface is generated. It is editable for update.
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