Cloning functionality in CRM

CRM 9.0
Tools 8.50

Out of the box,
Cloning of commonly used objects like opportunity,lead, etc. is provided.
The code behind the scene is fairly neat and usually does not need any modification.
If you need to pull additional scrolls in the cloning process, please take a look at the additional points mentioned below.

On the cloning setup page
Component RB_CLONE_DEFN
Menu RSF_SETUP_TABLES
This component is delivered 'Hidden' so you have to find it how to get there :-)

I would consider the examle of Opportunity cloning.

First, open the RSF_OPP_CI in app designer and add all the required scrolls, scroll fields to the right hand side pane and save.

Go to the front end and select RSF_OPP_CI and go to the second tab for field selection (Define Clone Fields). Click the 'reload' button and select 'Yes'.
It retains the old field selection and now select all that you want to get cloned.

Select the check box 'Prompted' if you want user to select whether to clone that scroll or not at runtime, i.e. on the actual opportunity cloning transaction page.
If you want a particular scroll to be always clone, implicitly, then do not select this option.

That's all and you are all set!