Hi Wendy,
Well, I figured out how to create a table like this (with the help of LiveCycle help, which is somewhat difficult to use, I find).
Here is how I finally accomplished creating a table where you can add as many lines are required.
1. Add a table to your form by selecting the "table" tool out of the "library" that appears to the right of your screen. Drag the table onto the form. When the "insert table" box pops up, select "create table using assistant" (the second option), click "okay", then in "body layout" select "rows vary depending on data" and enter the number of columns you want (add one extra column for the button that will add rows at this point), then click next, if you want a header row, select this option (or not) and click next, select if you want a footer row and click next, select if your table will have sections or not (probably not for users entering data) and click next, then select if you want alternate row shading or not and click finish.
2. to add rows to the table:
Select the "button" tool out of the library and drag it over to the spot you want the button to appear (generally the left-most column, in the first body row). Change the caption of the button (under Object, Cell) to whatever you want, but "Add Row" is likely the most obvious.
Then, in the row above the form you are working on, change "show: initalize" to "Click" from the drop down list (this allows the button to be activated by clicking on it with your cursor.
Beside this, in the white strip, put the text "Table21.Row1.instanceManager.addInstance(1);" in this space and click the green button to the right to update the information. In this text, make sure the "Table" portion has the same number or title of the table that you have named it, i.e. if it is table 1, it will be "Table1.Row1....".
Beside this white row, change the "Language" to "Javascript".
At this point, if you check your table, you should be able to click on the button and add a row. Now you can format the table to whatever you like.
If you want the boxes to expand (i.e. flow) to accomodate data, make sure you make the entire table a subform, and each cell a text enterable field and click "expand to fit" under "height" in the layout menu for that field.
This should give you a table that the user can add lines to as they need them.
I hope this helps you. It was frustrating to figure out for me!
Joanne