Is this possible under the rules of USCIS? I have a 485 pending which is based on employment. My I-140 was approved a while ago. I already had an I-130 approved which my husband had applied when he was a GC holder. He was naturalized recently, and we were suggested trying to substitute the I-140 with the I-130 and avoid a whole new I-485 application. Is this possible? (I searched online and saw some INS memo info that this is not allowed). Would the USCIS confirm the receipt, and later on the conversion of existing 485 to family-based? Any input is appreciated. Thanks