You'll see a group for continuous order details if the order type is a subscription or a standing order. 

Start date and End date

By default the Start date is today's date, and the End date is 1 year from today. But you can change these dates if you wish.

Issue expected

These fields are used to determine that date that each issue is expected. You can specify a number of Months or Days, and whether the issue is expected Before or After the cover date.

In the example below we're specified that each issue is expected 5 days after the cover date. So, for example, if the cover date for the February issue of a monthly magazine is 4/2 then the date expected is 9/2.

  

Issue price

This is the price that will be appear as the retail price when an item is checked in.