How to get Excel Importer addin to use the corporate proxy

Hi,

I am not able to connect to SpiraTest cloud instance via Excel Importer and when I am in the corporate network. However when I am outside the network I am able to make a successful connection. 

When contacted Security team here I am asked if I can setup the addin in such a way that it send the request via the corporate proxy.

I need to know from the experts here if its possible to configure the addin to route the trafic via the proxy(.pac file). and it can be configured in the excel addin? or a workaround to connect to spiratest instance.

We want to upload testcases using excel uploader and when we are in the company network.

Any help would be appreciated.

Thanks

Rahul