If the consulting firm has questions about the project, they can ask using the Q&A tab of the project. Any questions the consultants have will be here. Once you invited the consulting firm to participate on the project, the Q&A will be available. Click Q&A:
Here you can see all questions you have:
To answer a question, click the reply button on the right of the question:
A pop-up will be displayed, and you can answer there. You can respond privately to whoever asked the question or make the answer public if you want other consulting firms to know about it:
After you answer the question, you have the option to modify or delete the answer. Click edit or delete on the right side of the question: