Add Left Container field

It seems like you can do this with a section wizard. Just add fields into the container showed on the screenshot below and the system will create a new container automatically. 

Eugene Podkovka,

 In the custom sections only shows the profilecontainer.

Please add a new container manually and then use "Section wizard" to fill it in.

{

        "operation": "insert",

        "name": "UsrLeftContainer",

        "parentName": "LeftModulesContainer",

        "propertyName": "items",

        "values": {

            "itemType": Terrasoft.ViewItemType.GRID_LAYOUT,

            "items": []

        }

    }