it can be done using txt file or database. Just create a resource as db or lines from file . Now use PARSE LINE option in TOOLS .Parse in same order as data in txt file or db . Ex user,pass,email,cookie etc. Untick Reuse Resource will make load new line every time you parse.
@marlo If you check append, previous file result won't be replaced, you probably have action, which doesn't have append checked. If you are 100% sure, that append is checked everywhere upload your project.