What you are describing is not possible in the current version of BP. The exclusions are saved per-row, so you must have host names for them to be saved with.
On a separate note, if you are continually excluding the same updates each month, then I would encourage you to re-evaluate your process.
If you are using WSUS, then you should decline the updates on the WSUS server so that they are not made available to target computers, and then there is no need to exclude anything on targets.
If you are not using WSUS, then you should consider hiding the updates on each target system so that they do not continue to appear each month. To do this, use the ‘Actions > Windows Updates > Hide/unhide…’ option. Once the updates are hidden you will no longer need to exclude them. However, it *is* true that if Microsoft re-releases an update, it will move back into the ‘available updates’ group. One of the more recent examples of this behavior is with updates for GWX (Get Windows 10). People are hiding the updates only to see them re-appear at a later date. This leads me to my next suggestion…
If you are specifically trying to avoid the updates that are involved with the Windows 10 upgrade and GWX, I would suggest you follow the Microsoft sanctioned method for blocking the upgrade, which is described more here: How to Block the Windows 10 Upgrade. Then you do not need to continually try to avoid the same updates from month to month.
-Doug