How to change position of element using jquery

Question

I have html stuff as below:

<div class="field-group">
<label for="customfield_10102">select list</label>
<select class="select" name="customfield_10102" id="customfield_10102">
  <option value="-1">None</option>
 </select>
</div>
<div class="field-group">
<label for="customfield_10103">select list1</label>
<select class="select" name="customfield_10103" id="customfield_10103">
    <option value="-1">None</option>
 </select>
</div>

any number of option as per configured. query:

1. change the position of <select class="select" name="customfield_10103" id="customfield_10103"> to append with <select class="select" name="customfield_10102" id="customfield_10102"> (with 40 px margin) and also have to change both select list's width.

2. After that, remove <div class="field-group"><label for="customfield_10103">select list1</label></div>

Any one can suggest me , how i could achieve this using JQUERY?

NOTE: just for reference, i need such customization in JIRA custom field which can be achievable using jquery.

Another related query:

Below is HTML stuff:

<li id="rowForcustomfield_10102" class="item">
    <div class="wrap">
        <strong title="select list" class="name">select list:</strong>
        <div id="customfield_10102-val" class="value type-select editable-field     inactive"
            data-fieldtype="select" title="Click to edit">
            final2 <span class="overlay-icon icon icon-edit-sml" />
        </div>
    </div>
 </li>
 <li id="rowForcustomfield_10103" class="item">
    <div class="wrap">
        <strong title="select list1" class="name">select list1:</strong>
        <div id="customfield_10103-val" class="value type-select editable-field  inactive"
            data-fieldtype="select" title="Click to edit">
            1 <span class="overlay-icon icon icon-edit-sml" />
        </div>
    </div>
  </li>

I want to remove "rowForcustomfield_10103" and just it's contained a element "customfield_10103-val" place at next to "customfield_10102-val" with some margin. so, after that it will look as below:

`<li id="Li1" class="item">

    <div class="wrap">
        <strong title="select list" class="name">select list:</strong>
        <div id="Div1" class="value type-select editable-field inactive"
            data-fieldtype="select" title="Click to edit">
            final2 <span class="overlay-icon icon icon-edit-sml" />
        </div>
         <div id="Div2" class="value type-select editable-field inactive"
            data-fieldtype="select" title="Click to edit">
            1 <span class="overlay-icon icon icon-edit-sml" />
        </div>
    </div>
</li>`

Please also let me know on this.

have tried below but unable to change position:

if(AJS.$("rowForcustomfield_10102").length > 0)
{

 AJS.$("customfield_10102-val").after( AJS.$('customfield_10103-val'));
 AJS.$('customfield_10103-val').css({ 'margin-left': '40px','width':'80px' })
 AJS.$('customfield_10102-val').css({ 'width': '80px' });
 AJS.$("#rowForcustomfield_10102 .name").html(null);
 AJS.$("#rowForcustomfield_10103 .name").html(null);


}