Hmmm, not quite sure I understand what you mean. Tessellation is by default distance based and you can control that with the “Tessellation Mutliplier” inside the material. If you want to dynamically change that “Tessellation Mutliplier” I would use a material parameter collection then you can easily change it via blueprint in runtime.
If you want to have different “Tessellation Multipliers” per layer, you can use a landscape layer blend.
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As for tutorials, since I’m not quite sure I understand your question I can’t give you a recommendation there, only that you could try looking for something like “ue4 landscape tessellation”, but I assume you’ve already done that…