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struct param {
    uint256 amount;
    uint256 percentageBonus;
}

struct offerings {
    param proposed;
    param received;
    param accepted;
    param rejected;
}

mapping(address => offerings) public offeringData;

Like this, you will be mapping each address to a structure with four fields (proposed, received... etc) each of these fields have two fields (amount and percentageBonus)

you can use it like this, assume the user address is A:

offeringData[A].offerings.proposed.amount will give you the amount proposed by the user with address A.

offeringData[A].offerings.proposed.percentageBonus give you the percentage bonus. Same for the other variables.

You can set these doing, for instance,: offeringData[A].offerings.proposed.amount = value

Hope this helps.