If you're working with a standard business document, you're likely using the header and footer in your template. A simple example is provided in the section, Template: Header, footer and body area.

However, you might have a specific requirement for the footer, such as needing extra space for the total at the bottom of the last page. Naturally, you wouldn't want to reserve this additional space on the pages before the last.

The solution you choose will depend on how you wish to position the total. You likely want one of the following options:

1. You may want to display the total of the document in a flexible position – just after the last detail line.
   
2. The alternative is to output the total in a fixed position in the bottom of the last page.
   

Place the total after the last detail line

If you want to insert the total after the last detail line, then you should insert the total in the body of the template and right after the repeat loop, that outputs all the detail lines like below:

Output the total in a fixed position (in the bottom) of the last page

If you want to insert a larger footer on the last page of your document, then you need consider the two footer sizes. You might have one footer size on the initial pages and larger footer size on the last page. The limitation however is, that the footer height is in principle a fixed height, but there is still a way to add more space on the last page.

First you need to consider the height of the two footers:

1. The fixed (smaller) footer on the initial pages. We can call the height of this footer X.
   
2. The fixed (larger) footer on the last page. We can call this height Y.

We need to reserve extra space after the last detail line. This extra space is the difference between the two, which we can call Z. So Z is calculated as Y minus X.

So as an example if the small footer is 2 cm and the large footer (on the last page) is 6 cm, then the extra space to reserve is 4 cm. 

In the flow of the detail lines we need to reserve the extra space which is the difference in height (Z).

So when the template is setup you should set it up like below where the two containers with the height X and Z are placed in a dynamic position:

(The container with the height=Z is an invisible container, that might overlap the extra large footer on the last page).

In this way the details will keep away from the bottom of the last page in an area with the height of Z+X.

The setup above only reserves the space for the right sized footers, but we also need to consider the contents of these two footers.

We need a condition in order to determine if the current page is the last or not, so for that we add a variable, LastPage which should change its value when all detail lines has been output (then we know that the current page is the last. 

In the example below the variable, LastPage is initially set to the value, "No" and changed to the value 'Yes', when all detail lines (including the extra space). The value of this variable determines which footer details to insert:

Based on the logics of the variable, LastPage two different containers are inserted in the Select element inside the footer. 

The important things to notice are:

1. The first/outmost container in the footer has a fixed height (X), that match the small footer height. This must be a fixed height.
2. The small footer can be inserted either as a dynamic positioned container or as a fixed positioned container with position from the top (Y-position) =0.
3. In the footer position 0 from the top (Y-position) is the place from the top, where the small footer starts. If the small footer is 2 cm, then this is a position 2 cm from the bottom of the page.
4. The container with the large footer (for the last page) must be placed in a fixed position. This fixed position must be above the small footer, so here the Y-position must be negative with a value, that match the height, X (which is the difference between the large and small footer). So if the large footer is 6 cm high and the small footer is 2 cm high, then this position must be minus 4 like below