Hi! 

What you call block is a Screen?

Or 

A you have a screen with 2 tabs and you want to click on a link in a tab and open a WebBlock in the other?

Regards

Graça

Hi @ujwala T 

On screen you need have input parameter for know which block that needs to show, lets say BlockId (Input Parameter)

On parent block also you need input parameter that consume BlockId values, then name it as ex: BlockId2, when this BlockId2 = 1 then open block 1, if BlockId2 = 2 then open block 2.

You can use html attributes target="_blank". Follow this solution to open new tab https://www.outsystems.com/forums/discussion/54897/reactive-app-how-to-open-an-external-site-in-a-new-tab/#Post206420

Dont forget to set the BlockId parameter in the URL, ex: ..../Screen?BlockId=2, so the BlockId2 will turn to 2 and show the block number 2 in the new tab

Regards