How do I place a GTC order for a spread?

When creating a spread in Strategy Builder, you will see the Order Entry line at the bottom of the window. The system will default to a DAY order. Click on the drop down menu that says "DAY" and select "GTC" from the list. You can now transmit your order as a Good Til Cancel order.

Powered by IBot
How do I create a Good-Til-Canceled order?
How can I allocate an order to a specific account in TWS?
How do I enable IBALGO trading?
How to create duplicate orders when getting the "Large Order Size" message in Classic TWS