Some advice on complex expense management

Hello.
I must say that I am trying to use this exceptional PM software to manage complex programs of projects in the construction industry.
In order to manage the economic and financial part of the individual projects and then of the program, I would need to manage both the incomes, but especially the expenses, ie the many payments that, as Main Contractor, my company should carry out to the many suppliers and sub-contractors, in addition to its own employes, involved in the various projects.
As ProjeQtOr very thoroughly handles the financial part of the project incomes (requests for quotations, orders, invoices, payment deadlines, etc.), but more approximately that relating to project expenses, I would like to know if with some "artifice" or "forcing" I could somehow use its "incomes management" just to manage the expenses, which for my programs/projects are much more numerous and significant.
Obviously, all with the aim to check that the actual cost of the project (but especially the cash flows) are always within those budgeted and the budgets allocated for the activities/phases/projects/program (which are different from the estimation computations referred to the offer).
In this regard, I would also like to know how I can define budgets in ProjeQtOr for the various parts of the project.

In any case, I would appreciate any advice or suggestion on the best way to address this my need.
Thanks in advance

Hi,
thanks for the interesting answer.
I have been trying to do some test using objects provided for Incomes (Quotations, Orders, Bills, Payements) to manage the expenses of the project ... but it is definitely more complicated and perhaps useless, because the payments that I record, then do not come in addition to other expenses incurred and thus increasing the real costs of the project. Or there is a tip or trick that I don't know?
At the end, also reading the interesting post of Keloniton (who would like to use ProjeQtOr in an industry with spending management needs similar to my case), I think that might be interesting and useful for many other fields, to extend the detail and the power of all the "elements" (Quotations, Orders, Terms, Bills and Payements) currently only provided for Incomes, also to the Project/Program Expenses.
Do you think that might be possible one day, perhaps not too far?

Finally, I would like to report a little bug in the management of the Expenses Details Types, because it seems not to work the flag present in the mask to indicate whether the entered detail item should be considered only for project expenses, only for the individual costs or both. In fact, in the choice of the type of expense detail in the combos of Expense Detail Lines (both individual and Project) there are always all of the detail entries defined, regardless of the flag assigned.

Greetings

Thanks for... immediate replay.
I am glad to know that there are already plans to introduce the concept of "Purchase order" in the near future... I think it's really useful and important for other kind of projects (pratically not just IT).
But, without extend to much the details of expense management (to quotations, terms, etc), I am sure it would be sufficient just to manage the received bills and correspondent payements (also with a simple flag on the bill). In this way, it would be also possible to fully use the power of new "Financial Gallery"...