Hello @Nisha30 ,

Option 1 :

If Box A and Box B are both Choice type fields, you can link them directly through their dictionary configurations.

1. Right-click Box B and select Configure Dictionary.
2. Find the Dependent Field tab (or section).
3. Check the Use dependent field checkbox.
4. Select Box A as the dependent field.
5. Save the record.
6. Scroll down to the Choices related list.
7. For each choice in Box B, double-click the Dependent value column and enter the exact Value (not Label) of the corresponding Box A choice.

Option 2 :

If Box A and Box B are Reference fields pointing to other tables, you should use an Advanced Reference Qualifier.

1. Right-click Box B and select Configure Dictionary.
2. Set the Use reference qualifier dropdown to Advanced.
3. In the Reference qual field, enter a reference filter that references Box A's current value:
   javascript:'u_box_a_reference_field=' + current.variables.box_a_variable_name;

Option 3 :
Otherwise, Client script is the last option.

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Thank You,
Sujit Jadhav