Is there a task manager with gantt and multidimensional tasks?

Question

Project management

There is a web project on Bitrix (a large portal), in which, conditionally, there are 10 directions with three levels - from the main page of the section, through the archives of various sections, to the detailed end page: significant dates, persons, blog posts and news, etc. d. All this is implemented through "100" components. On the one hand, the project is divided into 10 thematic milestones, on the other hand, into 100 components. The same de components can appear as part of a task on 3 out of 10 thematic milestones/pages.
I would like to see a Gantt chart in the context of 10 thematic milestones and in the context of work on components that appear in several milestones at once, without duplicating, conditionally, pagination or lightboxes in each of the 10 milestones.
Have you met a product suitable for such an info-cut? Box, SaaS or whatever.