crystal report

i have three crystal reports.
1.phase.rpt
2. sector.rpt
3.catagory.rpt

in phase.rpt i have inserted subreport(named as sector) and connect it with the sector.rpt.
in sector.rpt report page i used another subreport(named as catagory) and connected it with catagory.rpt page.

when i click on sector in phase page it redirects to the sector.rpt page but that page it does not show the link(catagory) to catagory.rpt page.
please help me out.