Hi Prabakaran Gurusamy
you and Juergen and explained.
understand below structure. As said it mostly use for while creating WO/WT. which you go for picking you can group by joining storage bins with diff storage type.
eg >> let say you handle bulk sales and you have 4 storage type and while picking you want to group 2 for one picking way and 2 for other way. So you can make 2 activity area for picking activity and make that happen to flow. Now same bin can also allocate to other activity area with diff WOCR so picking can be simplified.
Regards
Suraj