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Hi CarolF_001,
I’m Daniel and I will be happy to help you with your question, I am a Microsoft consumer like you.
You can add the ISBLANK function to the formula by wrapping it around the cells you want to check for blank values.
For example: =SUM(IF(ISBLANK(q8),0,q8)-IF(ISBLANK(i8),0,i8)-IF(ISBLANK(j8),0,j8)-IF(ISBLANK(k8),0,k8)-IF(ISBLANK(l8),0,l8)-IF(ISBLANK(m8),0,m8),OFFSET(n8,-1,0))
This will check if each cell is blank and if it is, it will return 0 instead of a value, which will prevent the #VALUE! error from occurring.
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.
Best Regards,
Daniel