Assign depth 1 or 2 when exporting ALL files from tin

From USACE Galveston. They are getting XYZ data from contractors and to be able to display it in Cross sections and volumes they need to export ALL data. The issue is that cross sections can show by depth 1 or 2 and ALL files generated are auto-assigned depth 1 making some comparisons difficult if the depth they want to compare to us depth 2