Missing NetSuite Custom Fields

Missing NetSuite Custom Fields and details from purchase order line items when connecting from a QuickBase Connected Table

I have a QuickBase app connecting to NetSuite through a QuickBase connected table. I managed to get the PurchaseOrder data from NetSuite, but I also want the line item details from those purchase orders and I can’t find a way to get the data from the line items. Anyone knows if I am supposed to be able to pull line items details directly from the purchase order? Or do I need to create a second connected table to some line items table in NetSuite? If yes, which table is it in NetSuite?

I also created custom fields in NetSuite, but NetSuite custom fields don’t show up in the QuickBase “fields available from connected table” when configuring it in QuickBase. Is it normal that NetSuite custom fields don’t show up in QuickBase connected table configuration? How can I get NetSuite custom fields in a QuickBase connected table?

Thanks in advance,