Can you file several amended returns or only one

Several amended returns for different people?   Several amended returns for different tax years?   What are you trying to do?

For the same year?  You can amend a year more than once.  

after filing an original amended return, if you find additional adjustments you can amend the amended return. However, whenever possible all adjustments should be included in one amended return considering that it can take 6 months to process. you should not file another amended return until the prior one is fully processed. at some point you will no longer be e-file them through Turbotax for 2022 and you can't e-file prior years with Turbotax