Suppose there are two 'Dropdown' fields with the field names 'Project' and 'Premises' respectively. The 'Project' field has the values 'Kings Villa' and 'Wayne Towers', while the 'Premises' field has the values 'Kings Crown', 'Kings Residential', 'Kings Tower', 'Wayne Vista', 'Wayne Sky' and 'Wayne Amaze' respectively. We want the 'Premises' should only have limited options based on the value selected by user in 'Project' field i.e. if 'Kings Villa' is selected, the 'Premises' will only show 'Kings Crown', 'Kings Residential' and 'Kings Tower' as options, while the remaining three options will only display if 'Wayne Towers' is selected.

In such a case, you can use the drag and drop code editor to define a condition like below upon the 'onChange' event of 'Project' control:

1. From the left panel, go to first option 'Logic'. It will populate a list of logical blocks. Select the first 'if' block and drag it to the center of the editor.

2. Go back to left panel and select 'Logic'. Select the second block and drag it to the center adjoining the 'if' block as shown below.

3. Go back to left panel and select 'Custom Functions'. Select the second block 'Get Value' and drag it to the center adjoining the first blank box opposite the 'if' block as shown below.
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In the 'Control Name' dropdown, select 'Project'.

4. Go back to left panel and select 'Text'. Select the first block and drag it to the center adjoining the second blank box opposite the 'if' block.
In the text box, enter the text 'Kings Villa'.

5. Go back to left panel and select 'Custom Functions'. Select the fourth block 'Setter' and drag it to the center adjoining the 'do' block as shown below.
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6. In the 'Select Control Name' dropdown, select 'Premises'. In the 'Property Name', select 'Options'.

7. Go back to left panel and select 'Lists'. Select the second block 'create list with' and drag it to the block opposite 'Value' field in 'Setter' block.

8. Go back to left panel and select 'Text'. Select the first block and drag it to the 'create list with' block opposite 'Value' field.
In the text box, enter the text 'Kings Tower'.

9. Copy the 'text' block with the text 'Kings Tower' and create a list of the values to be displayed in 'Premises' dropdown as shown below. Change text for the second and third blocks to 'Kings Crown' and 'Kings Residential' respectively.

10. To create a similar block again, you can copy the entire 'if' block and make required changes in the copied blocks as shown below.

Change text 'Kings Villa' to 'Wayne Tower'
Change text 'Kings Tower' to 'Wayne Vista'
Change text 'Kings Residential' to 'Wayne Amaze'

11. Once done, click 'OK' (at bottom right) to save the changes and exit the code editor, then save / publish the form design as needed. Once the form design is published and executed, the changes will be applicable for the new forms created under the related form type.