There is currently not a way to create a terrain model from toggling multiple field books under the Survey Data tab. Users can currently use the Create Terrain Model From Field Book Selection Set tool to create a terrain from an element selection set of the survey data in the plan view. However, this enhancement would allow the user to create a terrain model from multiple field books, with a possible dialog box asking the user to toggle which field books to include in the terrain model. With this enhancement, the user would have the ability to create a terrain model from a selection set of elements from the survey data (Create Terrain Model from Element Selection Set) or by selecting multiple entire field books to include at the field book level (Create Terrain Model From Multiple Field Books). The current Create Terrain Model From Field Book Selection Set tool does not allow the user to create a terrain by selecting multiple field books. It allows the user to create a terrain by selecting elements from the survey data in the plan view, so these methods would be clarified with this enhancement.