Engaging the wider organisation through internal marketing

Dear procurement colleagues, For those who operate as part of a centralised procurement function within a large organisation, I am (pro)curious to hear how you might employ internal marketing to engage the wider organisation. My aim is to review how the procurement function that I am a part of is seen by its client business units and if you had any thoughts on the use of internal marketing. A wider question would be what tools and techniques do you employ to raise the profile of your procurement function in general? Thanks! Bradley