Assume a plan with 2 owners and a joint account. The goal is to be able to see the net worth of both individuals, even separately. In order to do that we need to specify where to pull cash from every planned expense or investment. I’d like to be able to set a specific planned expense of XXX €/m for one specific person and see if, on the long-term, it’ll be able to sustain it; same with investments and every other type of outflow.

Eg. person 1 savings account person 2 savings account joint savings account person 1 investment/pension account person 2 investment/pension savings account

Both persons have separate access of their own finances with their respective accounts or investments, both transfer separately from their own account cash to the respective investiment account or add personal living expenses. The joint account is used only to pay exclusively things that they share, for example household utilities, taxes, groceries, etc.