I am able to flow the content of one text box to another. i.e. if the text is too large to fit one text box, i create another text box, [so there are two text boxes], then I'm able to link those boxes, so that for a particular amount of text there are sufficient text boxes of specific size.
However, while doing these, is there an option that I am able to disconnect those two text boxes and the text matter of that text boxes gets split. Hence now I have two independent text boxes with independent text matter. ( i.e. if I keep adding more text to text box number 1 then indesgin would show a red dot below telling me that I have overset text.) Hope I've made my self clear.
Use the split story script that InDesign ships with.