Re: how to associate label in different sections?
Sounds similiar to what happens when you make a tabular layout for controls.
If you create a text box in the detail section, it makes a label next to it. If you then go to the control layout, and click tabular, it moves the label to the page header, with the text box control to the detail section. Pretty much as the description says, "Create a layout similiar to a spreadsheet, with labels across the top and data in columns below the labels."
So, you've either got something checked to automatically make all text boxes with their labels drop into a tabular layout, or you're trying to create text boxes through some other means than just clicking the text box button, and drawing a square with your mouse pointer in the detail section.