Issue fields may be used to define steps in the approval process. For example, you may choose the approver to be the assignee or the reporter of an issue. You can also have a selected group of users with custom fields.
Table below depicts the steps you can use:

Additionally, you can use the “Issue field - User” option to create a step for user/s mentioned inside the description of an issue. This option is available as “Description”.

In order for the description step to work, you must create a table with “Approval Path” header. Any users mentioned inside the table are then assigned to an approval step. Here is a template:

This can be a standard field or a custom field.

In the case of a custom field, you can use a user or multi-user select field.

Once user or users are determined this step behaves the same as User step

Resolve user

There are two options that allow you to reveal the approver,

• Approval start

• Step start

If the “approval start” option is selected, the approver will be revealed as soon as the the approval starts, (in the event of the approver missing from the issue field, this step will be skipped or definition will not be created).

Step start option, however, will only reveal the approver once the path has reached to the step.

Once the approver is determined this step behaves the same as User Step.