is there a way to export or create a datum so I can add that datum to V8i microstation

I only have access to v8i but I have  contacts that have connect edition and also bentley map so if there are files to be copied we can do that.

What I want is instructions on how to create the GDA2020 ( mga2020) zone 55 datum by export from map to be able to add it to Microstation V8i ss4 manually and be able to have msnt v8iss4 recognise the datum and use it to trans form GDA94 dgns to GDA2020.

BTW Were in Australia

We cannot use CE in our office,  I dont have  CE nor do I have map

in a past life I had map and was told if I didn't have a datum in v8i, I could create a custom  one in map and export it  for use in V8i... so why cant we do that for gda2020(mga2020(z54)?