Applying Lunch box on an irregular Patch / surface

Hi everyone, I would like to know how to constrain a lunchbox 2D truss on an irregular patch. It ignores the boundaries as shown on the picture.

query.3dm (780.0 KB) (8.6 KB) (187.0 KB)

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Thank you, HS_Kim!

Hey! Iā€™d like to know how can I add the pipe tool to line a and line b. Because Ive tried and it just pipes the whole structure.