Question: How do we get the custom size option in Product engine ?
Answer: You can easily do that in the product engine by adding an additional quantity component and would need to apply suppression in that quantity component.
Steps to apply Suppression in the additional quantity component:
a) Create an additional quantity component and click on Edit Suppression where you will enter all the triggers for the size option except for custom size.
Once you have set this up correctly this is how the results would appear on testing the engine.
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