I am trying to merge separately made body parts but those are of different resolution. Is there any way that I could go about merging them without loosing proportion. I am a starter an this will be my first sculpt please help.
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What do you mean? Your meshes don’t appear to be changing size.
Am I misunderstanding your issue?
Not the size when I dynamesh it the fingers merge and loose the detail. 
I don’t know what is wrong that I am doing.
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The main issue is your dynamesh resolution isn’t high enough to support detail at that level. You can try to increase your dynamesh resolution and if that fixes it you’re all good. If not, then you’re going to need to do a different series of steps to fix that.