Switching two forms associated with one list item

I have a list with two content types.  I created two forms based on the content types. I can create a new item with either form.

However, after I created an item with form1.  there seems no way for me to open it in the 2nd form.

My goal is to have two sets of data for each list item.  User will use form 1 to submit one set of data.  then user will open the item in form 2 to submit another set of data.

Is it possible? Thank you.