Microsoft Dynamics AX functional consulting Resarch

General information for the business: Microsoft Dynamics AX 2012
Industry: Internet/Software
Kind of support: Software
Description of support work: I need to hire some contractors to complete task based assignments on research items on about Dynamics AX2012 mostly focussed on the Accounts Payable, Procurment, and Cash and Bank Module

Basically, I'll just have research item from time to time and I'll pay per assingment for research.

As a test of candidacy I put 3 basic research questions (work I would need done) from simplest to hardest. Please respond with answers to them so I can determine who to hire. Answer them in the clearest possible way to convey the solution, imagine the audience to know only very basic dynamics AX navigation and knowledge

I'll pay about 20-50 per task depending on research length Price will be nogotiable

There will be a payment for who does this task the best and future work will be handed to said person
Extra notes: 1. How to enter a credit Memo in Dynamics AX and reverse a check?

2. What are the requirements needed to set up an ACH payment for Accounts Payable? List out requirements and steps

3. How do you invoice partially against a Purchase Order and cancel the remaining order of the PO. then, Finalizing the PO