How to use multiple checkboxes outside dgv

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C#

WinForms

Hi I've a combbobox (cbtables) which get its tables from sql server,
a datagridview (dgvrecords) which displays the table records when selected and
and four checkboxes (PN,CI,FI and RE) outside dvgrecords but rather in a groupbox. And maybe a Button (btnShow) to display the selected checkboxes.

If a checkbox is clicked, the clicked option and the relating columns shd be SUM and displayed and if mutiples checkboxes are clicked it shd combine and display.

I dont know how to correctly realize the problem.
An example to demostrate my problem:

The combobox and the checkboxes:
PN = ProjectNr
CI = City
FI = FKZ
RE = Region

[  cbtables  ]

[] PN
[] CI
[] FI
[] RE

The datagriview with some records:

ProjectNr  Region     FKZ   City      ABamount1  ABamount2   CFamount   …..
A.1234      North     LA    Accra      4000          -         1500     ….
A.1234      North     LA    Accra      6000        2000        7000     ….
A.1234      North     LI    Accra      8000        3000        3100     ….
Z.9012      Central   A     Togo       6000        5000        250      ….
Z.9012      Central   B     Togo       2500        1000        8000     ….
B.5678      South     LX    London     6000         -          2700

Experted Solutions:

[x] PN

ProjectNr    ABamount1  ABamount2   CFamount   …..
A.1234        18000       5000        11600    ….
Z.9012        8500        6000        8250    ...
B.5678        6000         -          2700  


[x] PN
[x] FI

ProjectNr      FKZ        ABamount1    ABamount2     CFamount   …..
A.1234          LA          10000        2000          1500     ….
A.1234          LI          8000         3000          3100     ….
Z.9012          A           6000         5000          250      ….
Z.9012          B           2500         1000          8000     ….
B.5678          LX          6000         -             2700



[x] RE
[x] PN
[x] FI

ProjectNr  Region     FKZ   City      ABamount1  ABamount2   CFamount   …..
A.1234      North     LA    Accra      10000       2000        1500     ….
A.1234      North     LI    Accra      8000        3000        3100     ….
Z.9012      Central   A     Togo       6000        5000        250      ….
Z.9012      Central   B     Togo       2500        1000        8000     ….
B.5678      South     LX    London     6000         -          2700

Is it possible. will appreciate your contributions