Hi,
This is actually explained in the “Placeholder Tags List…” help that you can find under the “Help” menu.
Essentially, you use a three part tag containing the number type, a keyword to identify the numbering stream, and a keyword to identify this particular number.
For instance, suppose in your document you have both tables and figures. These should be numbered separately, both using 1, 2, 3…, and you should be able to refer to the numbers in the text. In this case, you would use the <$n> number tag (because that gets replaced as 1, 2, 3… etc in Compile), something like “table” and “figure” for the central keyword, and then a keyword to denote the individual figure or table at the end. For instance:
-An Image Here-
Figure <$n:figure:GroundBreakingEquation>: A groundbreaking equation.
-A Table Here-
Table <$n:table:ComplicatedTable>: A very complicated table.
-Another Image Here-
Figure <$n:figure:TerrifiedCat>: A terrified cat.
As I have proved with my groundbreaking equation (see Figure <$n:figure:GroundBreakingEquation>) and listed in my very complicated table (see Table <$n:table:ComplicatedTable>), all cats fear headless people (see Figure <$n:figure:TerrifiedCat>).
When compiled, the above would become:
-An Image Here-
Figure 1: A groundbreaking equation.
-A Table Here-
Table 1: A very complicated table.
-Another Image Here-
Figure 2: A terrified cat.
As I have proved with my groundbreaking equation (see Figure 1) and listed in my very complicated table (see Table 1), all cats fear headless people (see Figure 2).
Now, I know what you’re thinking: I don’t want to have to write out all those complicated tags every time I want to refer to a figure or table!
You don’t have to. This is exactly what “Replacements” in the Compile panel is for. It allows you to simplify any complicated tags you need to use. You can set up Replacements like this:

Now, to refer to a figure, all you have to type is “{fig:FigureKeyword}” (e.g. “{fig:equation}”, “{fig:scaredCat}”) and to refer to a table all you have to type is “{tbl:TableKeyword}” (e.g. “{tbl:ListOfPlaces}”. So, the above could become:
-An Image Here-
Figure {fig:gEquation}: A groundbreaking equation.
-A Table Here-
Table {tbl:bigTable}: A very complicated table.
-Another Image Here-
Figure {fig:scaredCat}: A terrified cat.
As I have proved with my groundbreaking equation (see Figure {fig:gEquation}) and listed in my very complicated table (see Table {tbl:bigTable}), all cats fear headless people (see Figure {fig:scaredCat}).
I have a tutorial about this part-written, which I need to complete.
All the best,
Keith