Drawing-register.xls

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Hi guys, <br />
I'm racking my brain trying to work out the formula for a spreadsheet. <br />
<br />
To put it simply I'm trying to calculate how many drawings I need for a trade. <br />
I have put some comments in the spreadsheet to help understand what I'm trying to do. <br />
<br />
Do I need a macro for this or is a circular formula ok?<br />
<br />
I've attached the file. Please let me know if you need more info. <br />
Help is appreciated, I'm trying to make my drawing printing management more streamlined instead of looking at a 100 different items. <br />
<br />
Thanks<br />
<a href="https://filedb.experts-exchange.com/incoming/2012/09_w37/602303/Drawing-register.xls" target="_blank" class="file-inline" title="Spreadsheet in question.  (41 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Drawing-register.xls</a>
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Hi guys, 
I'm racking my brain trying to work out the formula for a spreadsheet. 

To put it simply I'm trying to calculate how many drawings I need for a trade. 
I have put some comments in the spreadsheet to help understand what I'm trying to do. 

Do I need a macro for this or is a circular formula ok?

I've attached the file. Please let me know if you need more info. 
Help is appreciated, I'm trying to make my drawing printing management more streamlined instead of looking at a 100 different items. 

Thanks

Excel Formula or macro?

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