Inserting Values Into Multiple Tables

I am using an unbound form to insert data into several tables, all related, at the same time. Please let me know if what I am trying to achieve is too ambitious!

I am developing a material sample library... any sample could be one material, two materials or three materials. Let us say that A, B, and C are three primary materials.
I have three Tables: tblX, tblY, tblZ.
tblX stores details for each individual material. Its structure is as follows:

tblX
XPK | ID | value1 | value2 |
01 | A | asdfas | asdfdf
02 | B | dfasdfa | sdfaf
03 | C | asdfffd | asdfg
(here, XPK is the primary key, ID is the name of the material and value1, vlaue2 are other descriptive fields...)

tblY stores materials that are combinations of two primary materials:
tblY
YPK | 1st | 2nd | ID | value1 |
101 | 01 | 03 | M | keiury |
102 | 02 | 03 | N | kjgeiih |
103 | 03 | 01 | P | djlkgoi |

(here, YPK is the unique ID for a sample, the '1st' and '2nd' fields are simply the primary keys from the tblX. ID is the name of this new material and value1 has descriptive values for samples M, N, etc.)

tblZ is the next level of material, made of combinations of materials from both tables tblX and tblY. it is like this:

tblZ
ZPK | 1st | 2nd | 3rd | 4th | ID | value1 | value2 |
1001 | 01 | 03 | -- | -- | R | asdprw | mnvd |
1002 | 01 | 102 | 02 | -- | S | adsfd | oirtyr |
1003 | 103 | 02 | -- | -- | T | werwq | pojfgr |
1004 | 02 | -- | -- | -- | U | alkfdp | uioite |
1005 | 01 | 02 | 103 | 102 | V | keqwei | oirewj |

(here, ZPK is the unique identifier, the primary key. as you can see, 1st, 2nd, 3rd, 4th are references to materials from either tblX or tblY or none, ID is the name of the material and so on.)

So, going back to the original primary materials, a sample could be a combination like A + (A+C) + B...

I hope I am clear enough till this point.

My unbound form (which is a very complicated one by now!) is where a user will start with such a sample and start putting in details for each of the primary materials. As he/she logs each individual material, I store that data in a temporary table (tbltemp). When all the primary materials are fed in, the user hits a 'Save' button, which is supposed to do the following:

1) save each primary material from tbltemp to tblX
2) extract their primary keys and then insert that into the next level table, either tblY or tblZ.

I have been working with ADO recordsets to 'addnew' data to tables and am adept with that. I have never simultaneously extracted data from one table and inserted into another. similarly, i have never extracted more than one record, and inserted them into a single record in another table, etc.

I will appreciate any guidance, both at conceptual level and at operational level, that I can get. If you would like to see my database, I could arrange to have it accessible; there is nothing confidential (only higly complicated, I think!).

If you are still reading, I already owe you a ton of thanks!!