Provided that the pattern is repeating after a finite no. of weeks, you can create a PWS with week 1, 2, etc, with different DWS in each week's Mon-Sun.
If there is no repeating pattern, then IT 2003 will need to be used. Data entry can be done for multiple employees/days in txn PTMW or PP61
If the WSR text indicates the type of shift, it helps the PT admin to select one.
Further the same PWS can be used in more than one WSR with different start point for the PWS (date). This is used for shift employees in a group, each having different off days, so that at least one person will be working on any one day.