Delete button tool bar level

Hi,

I have 10 business roles is there sales related

for eg :business role : 1) Salespro

                                    2)z1Salespro

                                    3)z2Salespro

                                   4)z3salespro

                                   5)z4Salespro

                                   6)z5Salespro

                                   7)z6Salespro

                                   8)z7Salespro

in tool bar level Diagnosis button is there

i want delete that button (Diagnosis) in particulare bussiness role in toolbar level.

      1) z1Salespro

      3)z3salespro

      7)z6Salespro

      8)z7Salespro

where i write the logic.Please share your ideas and logic.

Regards,

Sai