i want to ask a question about how to copy filter cell and paste it .
What is a filter cell?
You didn’t say what should end up in the pasted cell.
If your filtered range has one visible cell and you copy-paste it the default way, a value (plain number or text, etc.) will be in the pasted cell.
If you paste using Paste Special → Paste Special and then click the As Link box the pasted value will be a cell reference (row and column of another cell) to the filtered value.
If you reset the filter range, copy-paste the section of cells and re-apply the filters you will have a copy of the original filtered range.
There might be better ways to do this.
Some background about filtering cell ranges:
https://help.libreoffice.org/latest/lo/text/scalc/guide/database_filter.html