Triple Loop-Parsing data to new file

Hi, I'm fairly new to Excel VBA, this is suppose to be pretty simple, please help =)

So I need to extract raw data files onto another excel file, but I need to use loops to search for the data file needed. Here's the basic idea of what I need to do:

XREF_MODEL_SCHEMA.xls
'so here I need to do a loop to search for the "yes" under the "compare" tab in the sheet(shunt)
Row=Model_1st_Data_Row
'I am suppose to do a loop to identify the rows with "yes" under the compare, until the the cell is empty
Do Until is empty (cells (row,?))
compare = cells (row, column_SCHEMA_COMPARE)
'define COL_SCHEMA_COMPARE, so from the file, the compare tab is in column 1, but since it might change later, I don't want to hard code it, so I need to define it to column 1 for now, later on I only need to change the define if i need to make changes.
if (compare="yes") 'in this case the row with MODSW and row with BINIT are "yes"
'so here I go into the next attached file, under switched_shunt sheet, I need to search the columns until it finds "MODSW" and "BINIT" and remeber the corresponding number on the left of it, here it should always be row#-1,the numbers will be used later. Remember these 2 IDs are "yes" from the previous file. (MODSW and BINIT are the PSSE IDs)
PSSE_RAW_FORMAT.xlsx
then PSSE_ID= cells ( ROW,COL_SCHEMA_PSSE)
'the following is the file I need to parse the desired data to, as you can see, I need to copy the data into the sheet(shunt)
PSSE_MODEL2.xlsx
'I'm suppose to define this file as the following line suggests, but I'm not sure why...
Define PSSE Model
'next I need to go into the the attachment file PSSE_ RAW_FORMAT, (I will link again)[PSSE_RAW_FORMAT.xlsx
'and write the PSSE_ID (which is MODSW and BINIT in this case) onto my new file PSSE_model2PSSE_MODEL2.xlsxas headings
'I need to write the IDs as headings in row 1, since cell(1,1) is taken, I need to write them onto the next empty space in row 1, so in this case, MODSW would be in cell(1,2), and BINIT would be in cell(1,3), again I don't want to hard code them into those particular cells
Write PSSE_ID as heading onto PSSE_MODEL2
'now I need to go into the raw data file which is provided below, and filter to the data I want, which is the shunt data, and it starts after a record that starts with "0/" and contains the substring "BEGIN SWITCHED SHUNT DATA", uptil a recod that starts with "0/" and contains the substring "END OF SWITCHED SHUNT DATA". In this particular file, they are found in row 10193 and 10342 (for your convinience), although these 2 numbers will change as the parameters won't stay the same, so I loop that sorts through all the data and records the rows of datas inbetween these 2 substring. And only the columns that are determined by the corresponding numbers of MODSW and BINIT from the PSSE_FORMAT are recorded. (I highlighted that step as red, so it's easier for you to remember where we found the columns. So in this case, the columns we need are 2 and 8.
And last we just paste those data under the corresponding tab in PSSE_MODEL2
PSSE_RAW.xlsx

I know it's a lot of info, and some might be confusing, I tried my best to explain it, if you have any uncertainties, let me know, and I will do my best to explain.

Thank you