Yet Another Question But I Promise That It Will Be The Last.....for A Week

So i have just completed my database and everything works fine. Now, my managers wants me to go back and do it again for other internal companies. Mind you that we have over 100+ and i am not in the mood of going through and doing something that is not my job. Anyways, all of the companies have the same names for columns, tables and files. for example, 123table for company 123, 124table for company 124 and so forth. This is how it is for every single company. Since all of the data is in one Database, i was wondering if i could write a code or something which in the beginning will ask what company "you are" and what company you want to "dealing with"

For me, my company will be 123 and i will be dealing with 456. So when i enter this in the beginning, it will auto populate the info. In other words, I want to name everything in the query "*table" and that * to be filled by the company number you enter. I was wondering if this was at all possible.