component plug-in

I'm mostly curious as to why you would want to do this? This is the sort of basic functionality that Appian gives you, in an easy-to-build and easy-to-maintain fashion - i.e. low-code (plug-ins are high-code by definition). What will what you are proposing give you that Appian doesn't?

i want to display the organization chart which allow me to do the modification and reflect the same in the database.

You can use this OOTB component to browse your hierarchical data:

https://docs.appian.com/suite/help/23.4/Tree_Browser_Node_Component.html

What sort of updates do you need to conduct?

i want to add/delete/modify the nodes dynamically. i think that component shows only the read only, not allow to modify.

You'll need to add the necessary configurations/code to make this work but it is do-able. 

• you can add a link on each of the nodes. This link could be an a!startProcessLink() and you can pass the node's value to the process and in that process you could retrieve the data associated with that node for editing
• to move a node you could either re-use the above process, or you can use the pathSaveInto on the hierarchy browser component as input to a separate process (say as a different link in the user interface) to effect a "move node" action

You'll need to add the necessary configurations/code to make this work but it is do-able. 

• you can add a link on each of the nodes. This link could be an a!startProcessLink() and you can pass the node's value to the process and in that process you could retrieve the data associated with that node for editing
• to move a node you could either re-use the above process, or you can use the pathSaveInto on the hierarchy browser component as input to a separate process (say as a different link in the user interface) to effect a "move node" action

thank you for your suggestion. but its a requirement.