Adding custom drag and drop

Can someone please direct me to any information on creating custom drag and drop races and classes for character sheets? I have seen the coding for sheets themselves, but my coding skills are lacking to create custom sheets.

The drag and drop functionality is part of the compendium. Currently Roll20 does not support custom compendiums, but that is on the roadmap somewhere.

Outstanding, thank you. Do the charater sheets get info for classes from compendium or can I edit sheet to add new classes. Also a tutorial link on how would be awsome. As I am not very proficient at coding.

Currently there are only compendiums for Pathfinder (not as well organized) and D&D 5e (Much better organized). The  5e OGL ,  5e Shaped , and the  Pathfinder Sheet all have compendium drag and drop enabled for some features (I believe that the entirety of classes is not droppable on any of these sheets). If you are looking at making a custom sheet (you'll need a pro level account) you can certainly add in the info for the classes directly into the sheet, but all the sheets I referenced above work more like paper sheets in that you enter the relevant data into appropriate fields rather than auto-populating the sheet based on the class. The exception (sort of) is the 5e OGL sheet which does have some auto options populated by character selection. If you are just wondering about making a character in a game using a community created sheet, then how you do that will depend on your system and sheet.

I use the 5th ed auto sheet it is great for new players and easy to use. I may have to change sheets I guess. Found the custom section on it. I'll have to play with it later. The help section found for the sheet on that subject was just a paragraph long.