Yes,

Watch4net supports multi-tenancy by design.

There are a many ways to achieve this , But to give you a starter ... go to Administration->Roles. Make a new roles called customerA and configure its master filter to be for example  'source=%-CUSOMTERA'  this is assuming that you have a separate collector for each customer. this is a simple example and not the only way to do it. OOB you can tag a customer property so you can make the filter customer=="CUSTOMERA'.

If your device names have a customer code then do a filter like device='CSTA%'

Thanks guys, useful insight

I had been trying the device grouping as these are used for the chargeback reports

unfortunately we have multiple customers sharing an array/switch etc so I think this will need some sort of data enrichment.

At the moment I'm just not sure the best way of doing that. As this is just a PoC deployment almost all the hosts are discovered passively and the device names are the only way of grouping customers. But if I use just device name for a users options none of the arrays or switches are visible by the user. So looks like there's a bit more playing around needed.