1. If the customer only has one phone number, the information in the 'Phone' and 'Mobile' fields could be identical.
2. If the client uses a single email address, the 'Email' and 'Secondary Email' fields might both have the same information.
3. We have two separate sections in several CRM forms, such as the 'Address' field and the 'Permanent address' field. In the vast majority of cases, they are identical.
4. Consider a form that contains information about a person's educational background. If the contact information prompts you to enter the address of the institution under the Bachelors' and Masters' sections, and you wish to enter the same address in both sections, doing so manually is tiring. It will be simpler if the values are automatically populated.

1. Go to Setup > Customization > Modules and Fields > Select the required module > Links and button > +New Button.
2. Provide the needed details and choose the viewing positioning accordingly. (Preferable - View page)
3. From the drop-down menu that appears, select Writing Function.

1. Provide a name for the custom function and other essential details.
   
2. Click on 'Edit Arguments'.
3. Based on the examples map the required parameters. Module ID mapping is common for all the examples.
   

Enter the name as phone and select the value from the desired module.

Enter the name as email and select the value from the desired module.

Enter the mapping name for all the fields in the address and select the value from the desired module.

Enter the name as institution and select the value from the desired module. 

 mp = Map();

 //For example 1

 mp.put("Mobile",phone);

 //For example 2

 mp.put("Secondary_Email",email);

 //For example 3

 mp.put("Permanent_City",city);

 mp.put("Permanent_Street",street);

 mp.put("Permanent_Country",country);

 mp.put("Permanent_State",state);

 map.put("Permanent_Zip_Code",zipcode);

 //For example 4

 mp.put("Senior_High_School_Details",highschool);

 //Common for all examples

 autoPopulate = zoho.crm.updateRecord("Leads",lead_id.toLong(),mp);

 info mp;

 info autoPopulate;

 return "Fields are populated successfully";

Example 1 :

Example 2 :

Example 3 :