Unreal - Send data to already computed HDAs

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Hi guys,
I am pretty new to Houdini and I use it for my landscape creation for Unreal.

I want to make it as modular as possible, so I can reuse the digital assets.
So my question is - is it possible to modify already generated heightfields?

For example: I have a HDA for the landscape. Done. Everything is generated and hurai.
Now I want to add the tree HDA and for this I want to modify the landscape, so that under trees the ground gets a little bit raised up. Yes, I could reuse the already loaded height field and place a new one in unreal, but in the end I have two landscapes in Unreal.

What would be your solution for this?

Thanks for your help

Best regards,
Auke
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