Beginner reconciliation help: Required to define transactions into categories

Hi all, brief introduction - I am a new hire as an assistant accountant and my manager gave me an adhoc task to try out. Unfortunately, I have negligible practical experience in using excel at work so i'm taking a course on the basics of excel. It feels quite slow and I feel that a better "crash course" to learning would be to take up more tasks from my manager and use this forum to help me out on solving problems, quite a godsent that there's a dedicated forum to helping newbies out like me. (And excuse me for my articulation when explaining my problems I'm still getting the hang of it)

So, payments are categorised into A, B, C and D. I'm required to use the description as the parameters on where to place the payments into said categories like this:
A -> for "Name", "Date", #number, at, "Location"
B -> Charge for "email"
C -> "Location" - order "XXX"
D -> Description error

After definition which transactions belong to A to D, I need to determine the different locations for category A but I haven't gotten this far yet

My formula to finding these keywords are as follows: =IF(ISNUMBER(SEARCH("Charge For",K3)),"B",IF(ISNUMBER(SEARCH("for",K3)),"A",IF(ISNUMBER(SEARCH("X - Order ",K3)),"C")))

My idea of using ISNUMBER is to search for a string that matches the description with the parameters, then to either return the letter A, B or C or FALSE. I know this method leaves a large room for error and is an incomplete way to search. I also feel that the first step (Defining categories) and the second (determining locations) formulas are sharing the same concept with each other. I have attached a sample file, thank you