Need help in creating Knowledge module to aggregrate source data.

Hi Guys,
I am new to ODI and I am trying to create a Knowledge module. I went through the docs relating to Knowledge modules and APIs, so hopefully did my home work, I still find writing KM to be very challenging for the scenario, I have.
The following is my scenario.
I have two tables Employee and Department. Employee is the source and Department is the target. I need to sum salaries of all the employees belonging to a given department. And then insert the data into Department table.
Structure of the tables is as follows:
Employee(Source Table name)
Employee_id
Salary
Dept_id
Department(Target table name)
id
total_salary
Both target and source are on the same server. The user of this KM would drag and drop both source and target tables into interface and then map the columns. In the above case, Dept_id to id and salary to total_salary and then use this IKM. And off-course the user would indicate what columns would be aggregated on and what would be used as group by. One way to tag that, would be to use those UD1,UD2 tags in target column properties. (If there is another way to tag a column to indicate a column to be used for aggregation and a given column to be used in group by during run time in source, please let me know)
I choose to write IKM for this.
The challenging part is that I am having hard time figuring out the columns of source table as to what column should be used as group by and what column to be aggregated on. Since the tags are defined on Target columns and not on source columns. So have to figure out the appropriate columns through the mapping at run time.
The following is what I am planning to write in (Insert new rows ) command. And the part where I need help is how to compose select statement.
iinsert into <%=odiRef.getTable("L","TARG_NAME","A")%>
<%=odiRef.getColList("", "[COL_NAME]", ",\n\t", "", "((INS and !TRG) and REW)")%>
<%=odiRef.getColList(",", "[COL_NAME]", ",\n\t", "", "((INS and TRG) and REW)")%>
Select
source.column1,sum(source.column2) from <%=odiRef.getFrom()%> GROUP BY source.column1
Thanks.

I did try as per your advise.
Filter is not making a difference. Irrespective of me adding a filter or not, ODI generates a sql that has GROUP BY , just by looking at SUM(SALARY).
Coming back to the main issue, this does do what I wanted to do. I was planning on using a custom KM. But I guess, this is as good as custom KM, since the work done in an interface (assuming a custom KM exists) by going through either route is the same, so I can live with this approach.
Thanks for the help.

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