We have a requirement to enable Time Off requesters to indicate a substitute colleague during their absence. The user indicated as "substitute" needs to be involved in the approval workflow.
The current workflow configuration options do not offer this possibility, but I was wondering if anybody had a similar requirement for which they were able to come up with a suitable workaround.
Delegation is the answer as posted above but it has the downside that the delegation must be granted in advance so if the employee forgets or goes on leave unexpectedly, no delegation will happen. For such cases you can alsi implement workflow escalation which would reroute the workflow to another role after a number of pre-set days have passed without apprvoal. For example after 7 days without approval, the workflow is automatically esclated to HR, then HR could delegate to the appropiate person instead.
Hope it helps.