Copy/Paste problems

I am having unexpected problems copying and pasting.
I cannot see a problem with the following code,

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I have also split the Asterixed line by using SELECT / Selection.copy
This showed that the error was thrown on the selection part of the line

b is the column No of BDZ
y is the row no of the copy range
x = 3
I have tried using R1C1 as well as the cells notation. This fails too at the Range,Copy part of the code.
I originally had the error when using PasteSpecial (Which I will need to revert to)
Can somebody help please
John

I forgot to include the error message. It was 1004 Application or object defined error.
John

Firstly thank you, for your code works.
Secondly though, I don't quite understand why. The blue range is preceded with "Sheets("Sheet4")". Has this no standing?
John

Rorya
Thanks for your explanation. I had not understood that implication when using dot. Of course one usually is referring to the With object, so no problem. I have had occasions though, when you need to refer to two objects only one of which is the with object, and now I know why. Many thanks for your help
John