Any way to conform Tyflow Terrain to an existing topographical mesh?

[tyFlow]

Create a Birth Terrain operator and line up the terrain tile overtop your existing terrain mesh (easiest way: enable 'transform grid with node', assign a helper as the node and then move/scale the helper in the scene to adjust the terrain location).

Then add an Object to Terrain operator and select the existing geometry as the input geometry. You may also want to change the Object to Terrain operation to 'Set'.