Need help with my report, Dynamic line size2 (rdlc]

Question

Hi,

I have a RDLC report with body of 19 cm height.
My report body has a table with 2 columns and three vertical lines below the each column’s border.

 

The height of my table is various depend on my data source.

 

I want lines lengthen to the end of report body, but I don’t know the height of my table because my table data (so my table high) is dynamic.

 

For example if my table height is 6 cm I want the lines be 13 cm (19-6) and if my table height is 15 cm I want the lines be 4 cm (19-15)

How can I dynamically draw lines below my table up to the end of my body ?