To perform a simple calculation set mapping type to calculation and type constant or formula into calculation edit box
StrToFloat([INTEGER_F]) * StrToFloat([FLOAT_F])
[INTEGER_F]+ kilos"
Iif(StrToFloat([FLOAT_F])> StrToFloat([INTEGER_F]),1,2)
Trim('[CHAR_F]')
The good starting point is an Expression Editor.
For more technologies supported by our ETL Software see Advanced ETL Processor Versions