Basement bath drawin waste vent question

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Saint Paul
Installing a basement bathroom with toilet, lav and shower. The house main drain passes under the area where I'm installing the basement bath at a depth of 16" to 18" from the basement floor to the top of the drain pipe. Is it a bad idea to drain each fixture -- toilet, lav and shower -- individually into the main drain? Seems like it would be easiest to remove a six-foot section of the existing drain pipe and just piece together individual drain points.
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