Comindware Tracker can be configured to create multiple tasks for each item step.
For example here is a hiring workflow task currently at the "interviewing" step which is performed in two phases: HR person interview and hiring manager interview. Instead of creating 2 separate steps or creating one more subtask manually Comindware Tracker can be configured to do this automatically:
This hiring task has a primary subtask created and assigned to HR person - Sandra:
If we go ahead and open Sandra's task we will find one more subtask assigned to the hiring manager - Charles:
To configure parallel subtasks: