Pattern over polysurfarce

Hey, I need some help. I want to add a pattern to a polysurface. Just a simple groove pattern. Every tutorial I found just deal with a simple surface as a target to add a pattern. I can use the flow surface command on simple surfaces but as soon as my models get more detailed the surface becomes a polysurface. I tried Sub D but the pattern will be applied to each individual quad, I will appreciate any suggestions

this is an example of a simple Polysurface where I want to add a ridge/wavy pattern

The image below is an example where I was able to use the desired pattern over a simple pillow shape surface using the flow surface command. The challenge is to use this pattern over a Polysurface

check a few of the flowAlongSrf topics … there are many … also with similar question:

kind regards -tom