The simplest way is to use the paragraph's Number list property (choose Bullets and Numbering from the Paragraph panel's flyout menu).
In that case you don't key in the number or tab separating the number and the text. Like this where I have set a left indent large enough to clear a double digit number and then made the First Line Indent the negative of the Left Indent. When you use Bullets and Numbering the list numbers are added automatically:
If the list exceeds 9 items you can use the Indent To Here character (Type>Special Character>Other) to line the numbers up right justified on the period.
It's more work and requires that you key in the number and 2 tabs instead of using Bullets and Numbering, but can look better. So here the number 1's period lines up with 120's period while the text remains left justified:
Here with the invisibles showing. It's an Align to Decimal tab > Number > Left Justified tab > Indent To Here marker:
Thank you for your reply. Clearly I'm going to have to keep working at it till I get used to it.
Thank you again
the Tabs bar (completely & totally useless, its purpose is altogether mystifying.)
One thing to keep in mind about the Tabs bar—it shows the tab markers and their positions for the selected paragraph. So here I have a selection in the first paragraph and you can see the second tab marker is selected. If I move the marker, the second tab in the paragraph with the cursor or selection will be adjusted.
If I select multiple paragraphs with different tab settings, markers that are not included in all of the paragraphs are gray: