The Object Snap option positions control vertices on a target body. This option shapes the T-Spline body to the target body.
Object snap is available in Face, Edit Form, Subdivide, Insert Edge, and Insert Point.
The target body must be a solid body, surface body, or mesh body. You can manage the opacity of the target body by placing it in different component. Set the opacity of the component to a value less then 50 to see through it.
Use selection filters to manage objects that are selectable. Use the Select Through option to select objects that are behind other objects. Set the filters to only T-Splines objects to avoid selecting objects that cannot be snapped.