# GrapeCity.Spreadsheet.PivotTables.IPivotField.UsePreviousItemAsBase

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<h1 id="GrapeCity_Spreadsheet_PivotTables_IPivotField_UsePreviousItemAsBase_" data-uid="GrapeCity.Spreadsheet.PivotTables.IPivotField.UsePreviousItemAsBase*">UsePreviousItemAsBase Method
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<h4 id="GrapeCity_Spreadsheet_PivotTables_IPivotField_UsePreviousItemAsBase" data-uid="GrapeCity.Spreadsheet.PivotTables.IPivotField.UsePreviousItemAsBase">UsePreviousItemAsBase()</h4>
<div class="markdown level1 summary"><p>Sets the previous item in the base field for a custom calculation. Valid only for data fields.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">void UsePreviousItemAsBase()</code></pre>
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  <pre><code class="lang-vbnet hljs">Sub UsePreviousItemAsBase()</code></pre>
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