To insert a table from another document, copy the table, and then paste the table into the current document.
To convert text into a table, select the text, and then choose Table - Convert - Text to Table.
To insert a table into a table, click in a cell in the table and choose Table - Insert Table.
LibreOffice can automatically format numbers that you enter in a table cell, for example, dates and times. To activate this feature, choose LibreOffice - PreferencesTools - Options - LibreOffice Writer - Table and click the Number recognition check box in the Input in tables area.
Enter a name for the table.
Enter the number of columns that you want in the table.
Enter the number of rows that you want in the table.
Set the options for the table.
Includes a heading row in the table.
Repeats the heading of the table at the top of subsequent page if the table spans more than one page.
Select the number of rows that you want to use for the heading.
Prevents the table from spanning more than one page.
Select a predefined style for the new table.
On the Insert toolbar, click the Table icon to open the Insert Table dialog, where you can insert a table in the current document. You can also click the arrow, drag to select the number of rows and columns to include in the table, and then click in the last cell.
LibreOffice - PreferencesTools - Options - LibreOffice Writer - Table