B1 Visa Invitation Letter

Hi
We are a US based IT company majorly into SAP projects, our hiring will happen from India. We are planning to send few of our HR personals to US to help our US onsite recruitment team to conduct Campus interviews and also for client interactions.
Can you please advice which one shall we project (as a purpose of visit) when we address to embassy.
Regards

If they are going for client meetings project that aspect with relevant letters from the client asking those you plan to send to come for face to face discussions

Hi,
Please let me know the procedure "how to apply B1 visa" the basic requirement.
Regards
Sana