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Can you show an example picture please?
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you need first 3 letter permutation or last three digit or randomly 3 ???
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you need first 3 letter permutation or last three digit or randomly 3 ???

as show here

b1111.PNGhttps://filedb.experts-exchange.com/incoming/2018/03_w12/1289348/b1111.PNG

b1111.PNG

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OK, thank you, now please attach the workbook with the similar feature.
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OK, thank you, now please attach the workbook with the similar feature.

29090390.xlsb

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Great Job <br />
&nbsp;Best Expert !
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create the permutation of 3 &nbsp;digits from column IZ &nbsp;<br />
<br />
and show &nbsp;in column JQ &nbsp;and foward as needed<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/03_w12/1289333/4n_fam_tri_to.xlsb" target="_blank" class="file-inline" title="4n_fam_tri_to.xlsb (2.7 MB)"><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>4n_fam_tri_to.xlsb</a>
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4n_fam_tri_to.xlsb

create the permutation of 3  digits from column IZ  

and show  in column JQ  and foward as needed

select data in 4n to tri

Visual Basic for Applications (VBA) enables building user-defined functions (UDFs), automating processes and accessing Windows API and other low-level functionality through dynamic-link libraries (DLLs). VBA is closely related to Visual Basic and uses the Visual Basic Runtime Library, but it can normally only run code within a host application rather than as a standalone program. It can, however, be used to control one application from another via OLE Automation. VBA is built into most Microsoft Office applications.

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.