Ok, so I would suggest selecting the text and converting to a table with Table > Convert Text to table. Format the text and table as desired, including removing the default ruling lines above, below and within the table.

Create a paragraph style for the body of the table. I called mine CellBody.

Define a Paragraph rule below, as shown in the ss below.

For this result:

~Barb
EDIT: I recommend styles over any other approach because you can quickly format whole tables with a single click if you set them up thoughtfully with nested styles. When you have time, read up on paragraph styles, character styles, table and cell styles, and how to nest one within the other. I do a lot of long document layout, and IMHO, it's the only way to go.