DSXchange

I have source files that have ids prepended to each filename
In my sequentail file stage in the filename textbox is there anyway i can pass in a variablename in there. What i really want to do is pass in the filename as a job parameter and then read that parameter in the filename textbox

Yes , you can do that. You can define a job parameter, like SEQFILENAME.
and in the filename textbox, just give like #SEQFILENAME#, it will be repalced by the value what you are passing in the job parameter.