Javascript

I wrote this real quick and haven't tested it but it should give you a decent starting point at least.

var1 = '1234'; // this is the variable that you're passing in
varLen = 8; // length that you want your variable to be
for(i=var1.length;i   var2 = var1; // rename variable to preserve original data
  var2 += '0'; // add 0's
}

Here's a resource if you want to learn more about JS.
https://www.w3schools.com/js/default.asp

In your start node create a variable called "vSpace". I also created one called "vEOF" with what they required for an end-of-file marker.

Then using the ASSIGN node, add similar javascript commands for each field. The first addTrailingSpaces value sets the fixed length of the field, the last addTrailingSpaces puts in the number of spaces between each field

addTrailingSpaces(Qry1_JOB_CODE,9,0) + addTrailingSpaces(vSpace,16,0) +
addTrailingSpaces(Qry1_EXEMPT,1,0) + addTrailingSpaces(vSpace,15,0) +
addTrailingSpaces(Qry1_DESCRIPTION,30,0) + addTrailingSpaces(vSpace,225,0) +
vEOF

For fixed length field files I typically use SQL node to extract the data or manipulate the data because I feel like I have more control over the output with using a SQL node.

There is a javascript command .padStart and .padEnd such as

fielddata.padEnd(10);

That would pad the field data to 10 (or what you set) and you can add an item to pad with if you wanted: fielddata.padEnd(10,x)

However - I am not sure that function is included in the library within IPA.

This is probably kind of a 'crude' way but I have done something like this
Within the assign node build a javascript expression like this:

var as = addTrailingSpaces(strYourFieldHere, 50, 0);
var ss = substring(as, 0,10);
strYourFieldHere = ss;

So your first part you add spaces beyond any length you would expect that field to be. Then your second line uses the substring to cut it back down to the size you want. The result would be
A field has data that is 5 characters long, after the first line it would be 55 characters long. Then the second line cuts it down to 10 characters long. Leaving you with the 5 characters plus 5 spaces.

Crude but it works.

Thanks everyone!  It turns out addTrailingSpaces will work...I had the wrong number of spaces in one of my Assigns...Ugh.