A sink cutout is the one place a counter spec can't be vague: the opening has to meet a specific fixture, a specific cabinet, and a faucet drilling — all before the counter arrives. The good news is that speccing it well takes four numbers.
The four numbers
Opening width, opening depth, and the two centerlines — distance from the left end and from the front edge to the cutout's center. Undermount sinks cut to the manufacturer's template (usually slightly inside the bowl rim); drop-ins cut to the template's opening line and hide the edge under the flange. Either way, the template that ships in the sink box is the source of truth.
Respect the edges
A cutout wants meat around it — keep the opening at least a couple of inches off every counter edge, and more where a dishwasher below steams the underside. Tight reveals at the front edge are the classic failure point in any counter material; wood is no exception.
Place it on the drawing
In the Formhaus configurator, toggle the sink cutout and either drag the opening across the live drawing — size and centerlines snap to exact numbers — or attach the sink's spec sheet and let the shop cut to the template. The placement prints on your spec sheet with centerlines dimensioned, which is exactly the document your installer wants taped to the cabinet.