隐藏商店"颜色"属性在某些类别通过自定义布局更新

如何通过自定义布局更新在单个类别中隐藏此属性，我创建了一个新的css文件并在自定义布局更新中添加了下一个代码，我想隐藏颜色属性

<reference name="head">
<action method="addCss"><stylesheet>css/custommods.css</stylesheet></action>
</reference>

.faq_accordian .arrowlistmenu {
  visibility: hidden;
}

但是这段代码隐藏了所有的Shop By属性，因为所有的属性都有相同的类。这是style .css文件

/* ======================================================================================= */
/* ===================accordian */
.faq_accordian{margin:0;padding:0;}
.faq_right{
    width:732px;
    height:auto;
    float:left;
}
.faq_banner{background:url(images/media_banner.png) no-repeat;
    height:139px;
    width:724px;
    border-bottom:3px solid #fec00f;
}
.faq_banner h1 {font-family: 'futura_ltregular'; font-size:32px;color:#fec00f;margin-left:30px;margin-top:0px;padding-top:15px;font-weight:normal;text-transform:uppercase;}
.faq_banner p {width:330px;margin-left:30px;color:#cccccc;font-weight:bold;}
.faq_right h3 {padding-left:25px;font-weight:normal;}
.col-right {
    float: right;
}
.col3-layout .col-main {float:right;}
.col3-layout .col-wrapper {float:left;}
.col3-layout .grid_3 {margin:0;}
.col3-layout .grid_6 {width:490px;}
/*left menu */
.faq_accordian .arrowlistmenu{
}
.faq_accordian .arrowlistmenu .menuheader{ /*CSS class for menu headers in general (expanding or not!)*/
   background:url(../images/down_arrow.png) no-repeat scroll right 15px !important;
    color: #404040;
    cursor: pointer;
    font-family: "futura_lt_btlight";
    margin: 10px 0 0;
    padding:5px;
    text-transform: none;
    border: 1px solid #D5D5D5;
    -webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
font-weight:normal;
/*font-size:16px;*/
}
.faq_accordian .arrowlistmenu ul li:hover,.faq_accordian .arrowlistmenu ul li:hover a{background-color:#181818;color:#FFF !important;}
#narrow-by-list .arrowlistmenu .categoryitems li a:hover{color:#ffffff !important;}
/*.faq_accordian .arrowlistmenu h3 {
    margin: 0 !important;
}*/
.add-to-cart .button.btn-cart:hover{ border-bottom: 3px solid #000 !important; 
    margin-bottom: -3px;
    color: #000 !important;
    text-decoration: none !important;}
/*.faq_accordian:nth-child(2) .arrowlistmenu h3{ border: 1px solid transparent !important;
    margin: 40px 0 0 !important; }*/
.arrowlistmenu .menuheader{ /*CSS class for menu headers in general (expanding or not!)*/
   background:url(../images/open_arrow.png) no-repeat scroll right 12px  !important;
    color: #404040;
    cursor: pointer;
    font:bold 12px 'futura_ltregular', Helvetica, sans-serif;
    margin: 10px 0 0;
    padding:8px !important; 
    text-transform: none;
    border: 1px solid #D5D5D5;
    -webkit-border-radius: 0px !important;
-moz-border-radius: 0px !important;
border-radius: 0px !important;
}
.faq_accordian .arrowlistmenu .openheader{ /*CSS class to apply to expandable header when it's expanded*/
background: url(../images/down_arrow.png) no-repeat scroll right 10px #fafafa;
border:1px solid #eaeaea;
color:#000;
}
.faq_accordian .arrowlistmenu ul , .faq_accordian .arrowlistmenu ol{ /*CSS for UL of each sub menu*/
list-style-type: none;
margin: 0;
padding: 0;
margin-bottom: 8px; /*bottom spacing between each UL and rest of content*/
    background:#fff;
    border:1px solid #eaeaea;
padding:10px;
}
.faq_accordian .arrowlistmenu ul li , .faq_accordian .arrowlistmenu ol li{
    color: #404040;
    display: block;
    font-family: "futura_lt_btlight";
    font-size: 12px;
    text-decoration: none;
    line-height:25px;
    padding: 5px;
}
.faq_accordian .arrowlistmenu ul li p , .faq_accordian .arrowlistmenu ol li p{
    display: block;
    font-family: 'futura_ltregular',Helvetica,sans-serif;
    font-size: 14px;
    text-decoration: none;
    line-height:21px;}
.faq_accordian .arrowlistmenu ul li a , .faq_accordian .arrowlistmenu ol li p{
color:#666 !important;
}
.faq_accordian .arrowlistmenu ul li a:visited , .faq_accordian .arrowlistmenu ol li a:visited{
color:#cccccc;
}
.faq_accordian .arrowlistmenu ul li a:hover , .faq_accordian .arrowlistmenu ol li a:visited{ /*hover state CSS*/
color:#404040;
}

也许解决方案是为这个单一的"color"属性创建一个不同的类，并将其可见性设置为隐藏?但是在哪里的文件，我必须使css修改位于?

谢谢。