Can I add a 100 amp subpanel to a 200 amp main panel in a house and how

Yes you can. I have asked to have this moved to Electrical where tkrussel will give you a good explanation of how. Might let him know how close it will be to the main panel.

Will you be able to answer Labman's question?

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Originally Posted by labman

Might let him know how close it will be to the main panel.

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Can you tell me how much knowledge you have of wiring?

Here is an example of a 200 amp main panel on the left and 100 amp sub panel on the right. Picture attached

Good Luck!