Since your stats is based on COMM_AMT and BIZ_RATE include them in your base search.
Following are some of the options to display multiple values in Single Value visualization.
Option 1
index=transaction COMM_AMT=* BIZ_NAME=*
| table TSAC_NO, AGENT_NRIC, BIZ_NAME, MOBILE_NO, RANK_CODE, TEAM_NAME, PROPERTY, PROP_TYPE, TSAC_TYPE, COBROKE_AGENT, DATE_OPTION, DATE_SUBMIT, DATE_ENTER, DATE_INV, COMM_AMT
| stats sum(COMM_AMT) as COMM_AMT by BIZ_NAME
| sort -COMM_AMT
| eval NewField=BIZ_NAME + " - " + COMM_AMT
| table NewField
Option 2
You can pass second stats field i.e. COMM_AMT as a taken by coding preview event of search and then use either unit or underLabel option in Simple XML to print the value.
<single>
<search>
<query> index=transaction COMM_AMT=* BIZ_NAME=*
| table TSAC_NO, AGENT_NRIC, BIZ_NAME, MOBILE_NO, RANK_CODE, TEAM_NAME, PROPERTY, PROP_TYPE, TSAC_TYPE, COBROKE_AGENT, DATE_OPTION, DATE_SUBMIT, DATE_ENTER, DATE_INV, COMM_AMT
| stats sum(COMM_AMT) as COMM_AMT by BIZ_NAME
| sort -COMM_AMT
</query>
<earliest>-60m@m</earliest>
<latest>now</latest>
<sampleRatio>1</sampleRatio>
<preview>
<set token="commAMT">$result.COMM_AMT$</set>
</preview>
</search>
<option name="colorBy">value</option>
<option name="colorMode">none</option>
<option name="drilldown">none</option>
<option name="numberPrecision">0</option>
<option name="showSparkline">1</option>
<option name="showTrendIndicator">1</option>
<option name="trendColorInterpretation">standard</option>
<option name="trendDisplayMode">absolute</option>
<option name="underLabel">- $commAMT$</option>
<option name="unit">- $commAMT$</option>
<option name="unitPosition">after</option>
<option name="useColors">0</option>
<option name="useThousandSeparators">1</option>
</single>
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