Hello Nick,
SDM will just Export the data that it has, and Excel will just open what it is given.
So there are a few ways you could approach this.
1) Within MS Excel.
Each user would configure the option to stop MS Excel from automatically converting hyperlinks, for example:
https://contexturesblog.com/archives/2009/10/23/stop-automatic-hyperlinks-in-excel/
2) Within CA SDM
Edit the list_<object>.htmpl form so that it does not produce links with "http" in them.
You might have a custom List screen for the Export purpose, and another for regular use.
Or see for an example of having a column in the Export which is not visible to users.
3) Use another Report method.
You might be able to use an SDM Detail Report or a Jaspersoft Report to meet your needs.
Thanks, Kyle_R.