Setting 'inner' border with Styles and formatting. Is this possible?

I’m trying to style a table with different border widths. Using Format > Cells… I can easily set the outer and inner borders on a table based on the cursor selection. If I then save that as a style the ‘inner’ border formatting is lost. It seems that using the Styles and Formatting interface you can only set the four borders for a single cell and ‘inner’ formatting is impossible as the ‘style’ doesn’t look around the cell it’s assigned to for other cells of the same style.

So if I have a table with a .75 width border on it’s edge but each cell within the table has a .25 width border this all has to be set manually for each table. Styles and Formatting cannot do it. Is there another way?

If you create a 2x2 table, select it all and apply outer and inner borders as required, then keep it selected all, and create table style, then it should keep the inner formatting as well. Tested with 5.3.1.1.

How do I “create table style”? When I open Styles and Formatting there are glyphs for ‘Cell style’ and ‘page style’ but none for ‘table style’. This is on 5.3.0.3 on a Mac.

Sorry, I didn’t notice the Calc in tags.