How to make a group on bins. I have 100+ bins and further want to group it

It can be done with the help of a histogram instead of creating c. Create a histogram and then group the data. Also, as you cannot create a group on the Bin directly and so you need to use a calculated field group those intervals. You may check this article for the detailed steps to create groups on bins-

https://community.tableau.com/thread/188952?_ga=2.96895254.804085064.1577652955-1394860963.1552540153