Create approval definition
Watch for changes
Open Jira project or any Jira issue,
Click the Approval Path button in the left menu,
Go to the Definitions tab,
Click the Add definition button.
A new Approval Path form opens. You can add a step or a parallel group.
The Approval Path Name is required. It is important because later you can start an Approval Path from a list of created definitions.
Click the Add step button and choose the step type you require.
More detailed information about step types.
To create a parallel group click Add parallel group button. Drop step/steps in the marked area.