@Noriro2 Project Id, Sub Project Id, and Activity Id are restricted to a maximum length of 10 characters each. Currently, there is no built-in functionality to alter this limitation.
IMO, employing numerous WBS levels in this manner is not advisable even though it is possible to have sub projects within sub project.
Nevertheless, you can utilize the Activity Short Name field, which allows up to 50 characters though it is not a direct solution. Check if it can be used for the requirement instead.
@Buddhika Kurera,
Thank you for your reply, it is possible to have unlimited sub project one below the other, but WBS coding is limited, this is meaningless.
forming WBS codes like that it helps me to follow predecessors and successors by just looking at the code.
our projects have numerous WBS levels. Sometimes it reaches to 11th node. and this is very usual for us.
I thought using Activity Short Name field as well, but it doesn't not show up in Gantt.