Hello Rob,

Currently, it is possible to do with JavaScript, not the expressions.

What type of dectime field? What database is used?

The generic approach if dectime is integer or float:

1) In the ixBug - Header pre_place script set the sum to 0;
report.sum_blobbyman = 0;

2) In the Page Body (reportbody1) post_place script add the current value to the sum:
report.sum_blobbyman += report.cursor.columnValue( 'dectime' );

3) Add an empty expression field (e.g. expRate) to the ixBug - Footer - to output the resulting value

4) In the expRate pre_place script write your expression
report.controls.expRate.label = report.sum_blobbyman * 200;