New column based on four logical measure column

Hi All
I have four logical measure column which each one indicate how many activity under each service request.
ie value of each column is
col1 - 1,
col2 - 2
col3 - 3
col4 - 4 activities or more
Based on this can i create a new measure column, whenever any service request has two activitiy, my new column should show 2 (ie value col2)
can i do the max of all the four columns or how to approach this issue?.
Thanks

Yes, this is little bit complicated.
Since there is no direct SQL which extracts the number of activities under each Service Request in the existing setup. They used the nbr of rows in activity in relation to service request table. This way they calcuate the nbr of activities under each SErvice request.
In the previous request, business want to see how many Service request with one activity or two activties. Because of this, four logical column have been created.
Now My request need to see service request with one activity or more than one activity measure in the drill report. Since i have already show that nbr of service request with one activity or more than one activity in a chart format.
Instead of showing all the four measure in my drill report, i want to show if a service request has got one or more than 1 activity.

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1) 1.First of all set the logging level to 3 in the admin tool save it.
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settings(Answers right top)-->Administration-->manage sessions-->view log
When I try to do this I get the following message. and no log files.
Error
Log Could Not Be Retrieved
Odbc driver returned an error (SQLExecDirectW).
Error Details
Error Codes: OPR4ONWY:U9IM8TAC
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 43113] Message returned from OBIS. [nQSError: 27002] Near <3790667783>: Syntax error [nQSError: 26012] . (HY000)

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