In addition to Doug's suggestion, you can do it "old way". Create 2 report fields for INST. One with regular font and another with bold and underline. Put one on top of other and control wich one to print with Print When.

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>I have a table with following four fields:
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>INST C 20
>DUE N 05
>DONE N 05
>PENDING N 05
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>I created a report from it, it is working nice, but I want to add conditional format in it. i.e. the content of INST should be BOLD and UNDERLINED when value of DUE+DONE+PENING is 0 (Zero). Is it possible? How?
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