My question is , i have a dropdown in repeat block and i have three values like "one" ,"two" and "three". If i choose "one" and i press Add item in the block the next drop down should be displayed with only two options "two" and "three".Please help to clarify in the above needs.Thanks.
You can achieve this by using a Data Driven Dropdown and a Data Field.
1. Add these to your form within a repeat.
2. Add the data and filter call to your data field calculation rule.
3. Link the data driven dropdown to the data field