I'm not sure exactly what you want to do, so I'll make some observations and comments (based on my incomplete understanding of BW/CNTTS) that I hope will be helpful.
Originally Posted by Donald Cobb
The BW CNTTS apparatus is presented in 3 forms, each of them having features that neither of the others do. See the 11 minute video on CNTTS for an overview: summary (help / How-to-Videos / How to Use Study Tools in BibleWorks / Comparing Versions and Manuscripts / How to Use the CNTTS Apparatus).
The free-standing form is specially valuable for its "Introduction and Key" which gives a good explanation of the codes used, and the "MSS Key"
For searches you must use the Search form of CNTTS.
Concerning the codes:
The Variation Type can be misleading. "S", which is called "Significant" always refers to the base variant -- the one in NA27.
The same field is also called "Major Variations", and its values seem to flag significant variations from the base. For finding the major differences from NA27 I would suggest looking for A M R T in the "VU/MV type" box of the Search window.
The "Var. code" box uses a field that is used as a sequencing field -- it gives information, but is less useful for searching, since you cannot specify the range you want, and checking each possible value is quite tedious.
If you are willing to accept CNTTS's judgement on what are significant variants, the only fields on the search window you need set are the "VU/MV type" and the "MS".
All searches in CNTTS are OR searches. Thus, A M R T in VU/MV will pick up all of the major kinds of variants.
Each major manuscript has a number of codes. For example, P46 has 8 codes,
P46vid This is one reason you need to understand the codes, to help decide which ones to include in you search. (Hold Ctrl key down while selecting the 2nd through n Mss codes, or for a range select the first, then Shift select the last)
To do an AND search of manuscripts (which variants appear in several manuscripts) you need to do the search first on one (eg. P46, Pc, P*, etc.), with options:
"Search entire apparatus" and
"Replace results list with search results". Then change the manuscript code to the next one (eg. B, Bc, B*, etc.) with options:
"Search previous results list" and
"Replace results list with search results". This will give you the variants that are shared by the two mss.
And you can go on and see what a third shares with the previous two.
I tried searching for P46 (all 8 varieties of P46) for A M R T variants, and found 1021.
I then searched those 1021 variants for B (all 7 varieties of B) and found 112.
I know I've rambled on, but hope it is of some use to you.