To create the formula you described, you can use the IF, AND, and OR functions together in Excel. Here are the steps:

1. Start by typing the following formula into the cell where you want the result to appear:
   
   
   Code:

   =IF(AND(X=1,OR(Y=3,Y=4,Y=5,Y=6)),"OK","NOT OK")

2. Replace "X" and "Y" with the cell references for the cells you want to check. For example, if you want to check if cell A1 equals 1 and if cell B1 equals 3, 4, 5, or 6, you would use the following formula:
   
   
   Code:

   =IF(AND(A1=1,OR(B1=3,B1=4,B1=5,B1=6)),"OK","NOT OK")

3. Press Enter to see the result. The formula will return "OK" if both conditions are met (cell X equals 1 and cell Y equals 3, 4, 5, or 6), and "NOT OK" if either condition is not met.

That's it! You can copy and paste this formula to other cells if you need to check multiple sets of data.