First user can go to the inventory module > go to batch management and click on the unblocked.
Next user need to scroll to the right of the preferred batch to be blocked and then click on block, once user have clicked on the block, a pop out will appear now user need to input reasons for the batch blocking, once done user may click on the Block option.
Now to release the blocked batch
User can go to the Blocked batch, and view all the blocked batch
Now from the batch line, you may scroll extreme right and find release batch option, click on release batch. Release batch pop out will appear, input the reason and click on release.
by performing these steps you have successfully blocked and released the blocked batch.