Given that they told me I would get back pay and I worked conditional on that information, am I entitled to it?
You are entitled to backpay in accordance with the terms you accepted from HR. The employer's refusal to pay you from October 1st is in violation of Austria's Allgemeines bürgerliches Gesetzbuch at § 860a.
At this point you have fully complied ...
Go to the Arbeiterkammer. It's a institution designed to help employees on such matters.
Call them at Tel. +43 1 501 65 1341 (Mon-Fri 8am-2pm) to arrange an appointment. You may need to speak German or find someone to help you who speaks German. More info here: https://wien.arbeiterkammer.at/ueberuns/kontakt/index.html
can it be decided to use that pool of money for other purposes?
Changes to a contract need to be agreed upon by all the individuals who insofar as parties to that contract have grounds for objecting to that change.
A promised stimulus or bonus on the basis of merit is a form of delayed compensation contingent on outperforming others and/or reaching a ...
What type of contract I can use? Where I can find an agreement template for such case?
Contracts are not classified in the way you seem to have in mind. A contract just needs to be reasonably clear about the parties' rights and duties.
Among other characteristics, the contract will preferably be self-contained, reflect the parties' intent, have no material ...
B sues A
Under your scenario, the Client is a Principal and A is a Contractor under a Contract and A is the Principal and B is a (Sub)Contractor under a different (Sub)Contract.
Assuming that B has fulfilled all its obligations under the Subcontract with A then A owes them the agreed payment and B sues A for the liquidated debt if they don't pay. Whether A ...