The transition defines the order in which the process nodes have to be executed. For example, if the manager approves the leave request the approval has to be sent to the employee and HR. In order to move from Approve Notification node to Approve Finish node, a transition is required. While transition, it passes some information to the next node.
To add transition to a node, follow the steps below:

To delete a transition, select the
button.
To edit the transition click on the transition, here okay. The Process Transition screen appears. Edit the transition and click Apply button.

If the node is a Fork type, the transition is to multiple nodes, as mentioned below:

Here the transition of ApprovedOperation is to HRNotification and ApproveNotification. To delete transition click "Delete" -button. A message window appears. Click “OK” button to delete the transition.