1. Create a custom function with Deluge Script 
   
2. Edit a custom related list 
   
3. Delete a custom related list 
   

1. Create a web tab 
   
2. Delete a web tab
   

Related lists

Adding a related list

1. Log in to Zoho Developer console and click Extensions for Zoho CRM.
   
2. Select the extension you'd like to modify and click Edit.
   
3. Click Customize option in the left pane and click Related List.
   
4. From the drop-down list, select the module you'll be adding the related list to and click Create.
   
5. In the Add Related List Custom Function page, fill in the following details:
   
6. Enter the Function Name in the text box provided.
   
7. In the Deluge Script Editor, code your own logic and click Save and Close.
   To learn more, see also: Deluge Script 

Edit a custom related list

1. Log in to Zoho Developer console and click Extensions for Zoho CRM.
   
2. Select the extension you'd like to modify and click Edit.
   
3. Click Customize option in the left pane and click Related List.
   
4. From the drop-down list, select the module that contains the related list you'd like to edit. The related lists for the module you selected will be listed below.
   
5. Click the Edit icon []next to the related list you'd like to edit.
   
6. A popup window will appear. Make your changes and click Save.

Delete a custom related list

1. Log in to Zoho Developer console and click Extensions for Zoho CRM.
   
2. Select the extension you'd like to modify and click Edit.
   
3. Click Customize option in the left pane and click Related List.
   
4. From the drop-down list, select the module that contains the related list you want to delete. The related lists for the module you selected will be listed below.
   
5. Click the Delete icon [] next to the related list you'd like to modify.
   
6. A confirmation message will appear. Click OK.
   

Webtabs

Create web tabs

1. Log in to Zoho Developer console and click Extensions for Zoho CRM.
   
2. Select the extension you'd like to modify and click Edit.
   
3. Click Customize option in the left pane and click Web tabs.
   
4. Click Create Web Tab.
   
5. In the Create Web Tab page, fill the following details:
   
6. Provide a Name for the webtab.
   
7. Select the URL Pattern.
   External URLs open external webpages inside Zoho CRM.
   Custom Apps open the creator application that you've created.
8. Provide the Link to the external webpage or creator application.
   
9. Click Save.
   

Note

• Creating a webtab will add another tab to the user's Zoho CRM account, similar to any other module tab. Because of that, you can't create tabs with the same name of any of the existing modules (eg. Leads, Potentials, Reports, etc.).
• The web tabs that you create will not be linked to the other modules in your CRM.
• Some third party web pages cannot be added in the web tab. These websites restrict their content from loading inside another websites to avoid click-jacking attacks. They use the X-Frame-Options HTTP response header to indicate whether or not a browser should be allowed to render a page in an iframe. 

Delete a web tab

1. Log in to Zoho Developer console and click Extensions for Zoho CRM.
   
2. Select the extension you'd like to modify and click Edit.
   
3. Click Customize option in the left pane and click Web Tabs.
   
4. Click the Delete icon[] corresponding to the web tab that you want to delete.