How to deal with a variable with multiple responses (choices)

[ALKEBSEE RADWAN]

Dear all,
I want to remove one response from a variable which contains several responses.
How I can do that ?
please see this
this is how my data looks like

----------------------- copy starting from the next line -----------------------
[CODE]
* Example generated by -dataex-. To install: ssc install dataex
clear
input str35 personnelid
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
""                          
"10131940,30639691"         
"107259,107259,107259"      
"107259,107259,107259"      
"30104258,30262459"         
"30104258,30262459"         
"30104258,30262459"         
"30104258,30262459"         
"30104258,30262459"         
"30104258,30291683"         
"30104258,30291683"         
"30104258,30291683"         
"30104258,30291683"         
"30104258,30291908"         
"30104258,30291908"         
"30104258,30291908"         
"30104258,30291908"         
"30104258,30302402"         
"30104258,30335049"         
"30104258,30343554"         
"30104258,30357235"         
"30104258,30371583"         
"30104258,30429955"         
"30104258,30429955"         
"30104258,30430230"         
"30104258,30547034"         
"30104258,30583969"         
"30104258,N/A"              
"30105096,30259940,30430171"
"30105096,30299795,30429328"
"30105096,30334768"         
"30105096,30334768,30429833"
"30105096,30361782"         
"30105096,30368369"         
"30105096,30428814,30368369"
"30105096,30428823"         
"30105096,30430186"         
"30105096,30430186,30429833"
"30108230,30342068"         
"30108230,30342068"         
"30108230,30357355"         
"30108230,30394712"         
"30108230,N/A"              
"30108230,N/A"              
"30108848,30361514"         
"30108848,30361514"         
"30108848,30361514"         
"30108848,30361514"         
"30108848,30429596"         
"30108848,30429596"         
"30108848,30429596"         
"30108848,30429596"         
"30108848,30429596"         
"30108848,30429596"         
"30108848,30429971"         
"30108848,30429971"         
"30108848,30545287"         
"30108848,30583598"         
"30112670,30258685"         
"30119060,30429039"         
"30125158,30287066"         
"30125158,30287066"         
"30125158,30287066"         
"30125158,30295085"         
"30125158,30295085"         
"30125158,30336749"         
"30125158,30372934"         
"30125158,30429338"         
"30125158,30429543"         
"30125158,30429600"         
"30125158,30429600"         
"30125158,30546914"         
"30125314,30262604"         
"30125314,30262604"         
"30125314,30262936"         
"30125314,30262936"         
"30125314,30262936"         
"30125314,30262936"         
"30125314,30307505"         
"30125314,30363919"         
"30125314,30363919"         
"30125314,30363919"         
end
[/CODE]
------------------ copy up to and including the previous line ------------------

[Carlo Lazzaro]

Alkebsee:
you may want to try:

drop if response==<thevalueyouwanttodrop>

A word of advice: save a copy of your original dataset before going -drop-.

[ALKEBSEE RADWAN]

Alkebsee:
you may want to try:

drop if response==<thevalueyouwanttodrop>

A word of advice: save a copy of your original dataset before going -drop-.

thank you very much