Importing Data From External File

I have bit of code that opens an external excel file (call it the source workbook), grabs certain data, copies the data to other excel file (call it the destination workbook), and then closes. I have most of the code completed but am running into an issue with how to grab certain data from the source workbook and copying it to destination workbook.

I want the code to read the data in the source workbook line-by-line.

For each line that is read, I want to copy part of that data (value in column A and column B) to column A and column B of destination workbook only if the value in column D is equal to “Block”. For column C and column D, I want to do some form of lookup, being I want the code to look at each line of data until it finds corresponding line in which column A = “60612105” and in which column B = the value in B. Once this line is found, copy the value in C to column C of destination workbook and value in D to column D of destination workbook.

I have attached two files. First file is the import file (destination workbook) which has two tabs; (1) import tab (2) desired result. Second file is the raw data file (source workbook). Hopefully this makes since.