Using the ten-point range of the LOWEST scored sub-scale (psychological or  social/occupational), determine where the individual  fits in the identified number range (e.g. 22, 47, 59), based on a hypothetical comparison of all individuals in that range. 

  Remember the significance of transitional scores (40-41 & 70-71).  If uncertain, I suggest using the mid-point (eg. 45).  By doing so, you retain the option of being able to later score significant progress or regression in the identified functioning range.  

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71-80    Limited or expectable reactions

OR

61-70    Some difficulty but functioning pretty well

?

61-70    Some difficulty but functioning pretty well

You choose the sub-scale with the lowest number range  (Social/Occupational in this example). Given that the subject is functioning higher in the other sub-scale, I'd suggest using the upper side (65-70).  

Based on limited information, I wouldn't want to give it a transitional score of 70.

  Thusly, a score of 68 would be appropriate for a subject whose functioning is stabilizing or being maintained.  While a 66 would be appropriate for a subject whose functioning is deteriorating.