Is it possible to write an If function within a sub??

[06639071]

I am pulling data from one workbook and inputting it into a second, and returning calculations from the seond to the first workbook. I was wondering is it possible to write and If funtion within my sub, so that when a cell I pull from the first workbook goes below a certain value it automatically inputs a certain number

Application.Goto Workbooks("Paul_Nicholson.xlsm").Sheets("Discharging").Range("Q17")
    formTemp = Range("Q17").Value                               'strings of data from the second workbook
    Range("Q17").Select                                    'puts temp into refprop
    Selection.Copy
Application.Goto Workbooks("Refprop.xls").Sheets("Examples").Range("A37")
    If(formTemp>=810.77,formTemp,810.77)=Range("A37")

Want something like this however this does not work