Table size needs to constant irrespective of the number of rows

I am designing a print invoices RTF with headers and lines section. In the lines section I have a table which should be fixed height.  In my RTF I have the table height and the rows needs to iterate with in the table.

But in the current RTF irrespective of the number of rows its adding the space which i have added to fix the table height to the end of the rows. I do not want the extra space to be added but I want the rows to iterate only with in the given table height.

Eg:

Even if the table has one row the table height needs to be fixed. If there are more number of rows in the table the output needs to be displayed in new page with the rest of the rows with out adding the extra space at the bottom of the lines table. Also the number of rows may vary depending on the data for each line.