Script to select last row of a long table in every page when Page divided in textcolumn

I have a problem in a script written to automatically flow long table over pages and i need now to select the last row in every page Textcolumns.

when it is in Same page but two text column than last row of table in first textcolumn.

=> when it is in  firstpage second textcolumn and another page first textolumn .

=> table can be more than two pages so every page textcolumn Last Row of table ia have to catch.