Any cell in any worksheet can be referred to by being explicit thus:
Thisworkbook.Sheets("Sheet2").Range("C3")=ThisWork
book.Sheets("Sheet1").range("V45")
(those last two lines should be on one line)
or
ThisWorkbook.Sheets("Sheet1").range("V45").copy
Thisworkbook.Sheets("Sheet2").Range("C3")
(those last two lines should also be on one line)