If you want to indicate whether something is still being worked on...
You can have a calculated field that tests if there is an End Date to set a boolean In Progress flag, that you can then use to drive the Symbol mark card (an X symbol perhaps).
If you want to mark this along a trend....
You may want to plot this using a Gantt chart, with the Start Date and the duration of each project, found using the DateDiff() function.
See this link for an example.
Please attach sample data as twbx format and illustrate your expectations.
Thanks Johnathan. Regarding the End Date - it's present for all projects regardless of whether they're being worked on or not so would that rule out the boolean in progress suggestion?
I'll will need to obfuscate the data so will build out a dummy data set and send that on asap. Thanks.
No, you could test if it is past today.