[SOLVED] Populate a cell on multiple Worksheets

Is there any way, using a macro for a text entry box to appear where the user can enter text and for that text to then populate the same cell on multiple worksheets within the same workbook?

I need for example to enter the same text in around 1,000 worksheets in cell CB11, however this text may need to change at a later date and it is going be painstakingly time consuming to have to copy and paste this text manually now and in the future into every worksheet.

Many thanks