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Typically this is not cheap nor simple, however. It involves jackhammering out concrete to install a 'sewer ejector pump' under the floor and running all your drains to the pump.
The pump then electro-mechanically pumps the waste water up to the existing sewer drain where gravity takes over.
Otherwise for adding a commode only, there are more simple 'up-flush' toilet kits you can purchase from most home improvement stores.