Is it possible to report on payroll costing data with the position that the cost relates to?

Summary:

We have a business need to be able to separate out costs for a position change and to be able to report on them separately, but the data table only holds the assignment number and the costing string. In some cases the costing string will be different so you get two sets of costing data, but there is no obvious way to tie this back to the position that it relates to, and in other cases the costing string will be the same so the costs would be combined, unless you can link to the position to separate them