Creating moulds from 3d solids

I have created a part which I would like to make a mould and 3d print the mould for a one off sample.
Is there an easier way to do it than essentially subtracting the solid part from a larger mass then dividing it up and adding flanges? It's quite a complex part so will need about or 5 sections to the mould so will be a long and tedious endeavour

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