You know this site?
The code could be include in coreBOS ?
https://ourcodeworld.com/articles/read/434/top-5-best-free-jquery-and-javascript-dynamic-gantt-charts-for-web-applications
https://github.com/jsGanttImproved/jsgantt-improved
Or
Another option is the same in vtiger 7
http://demo7.vtexperts.com/vtigercrm7demo/index.php?module=Project&view=Detail&record=1231&mode=showChart&tab_label=Project%20Chart&app=PROJECT
The code could be include in coreBOS ?
https://ourcodeworld.com/articles/read/434/top-5-best-free-jquery-and-javascript-dynamic-gantt-charts-for-web-applications
https://github.com/jsGanttImproved/jsgantt-improved
Or
Another option is the same in vtiger 7
http://demo7.vtexperts.com/vtigercrm7demo/index.php?module=Project&view=Detail&record=1231&mode=showChart&tab_label=Project%20Chart&app=PROJECT
Ranieri
eCRM Web
eCRM Web