Not sure if I will be of some help...
Have you tried to create an Historical - Interface Traffic report and to add in the filter results tab two conditions to only retrieve stats from these two specific interfaces.
In the Select Fields tab, select e.g. the Total Bytes Recv+Xmit field. Do not add any Interface Caption or Name fields to keep the results unified to avoid having results grouped by interface.
That should return you statistics on a single line for both interfaces.
i am now getting what i wanted thanks to your suggestion. i think the key is filtering on INTERFACE ID.
thanks for the reply
Can anyone share how this can be done, thanks
I have 7 Interfaces and I need to show sum of them in one line, thanks